diff --git a/app/controllers/api/v1/audience_segments_controller.rb b/app/controllers/api/v1/audience_segments_controller.rb
index 3b5b8c3f8..d2eddf5a7 100644
--- a/app/controllers/api/v1/audience_segments_controller.rb
+++ b/app/controllers/api/v1/audience_segments_controller.rb
@@ -1,12 +1,30 @@
 module Api
   module V1
     class AudienceSegmentsController < ApiController
+      DEFAULT_PER_PAGE = 30
       MAX_USER_IDS = 10_000
+      USER_ATTRIBUTES_FOR_SERIALIZATION = %i[
+        id username name twitter_username github_username
+        profile_image website_url location summary created_at
+      ].freeze
 
       before_action :authenticate_with_api_key!
       before_action :require_admin
       before_action :restrict_user_ids, only: %i[add_users remove_users]
 
+      def index
+        page, per_page = pagination_params
+        @segments = scope.including_user_counts.order(id: :desc).page(page).per(per_page)
+
+        render json: @segments
+      end
+
+      def show
+        @segment = scope.including_user_counts.find(params[:id])
+
+        render json: @segment
+      end
+
       def create
         @segment = AudienceSegment.create!(type_of: "manual")
 
@@ -25,6 +43,13 @@ module Api
         end
       end
 
+      def users
+        @segment = scope.find(params[:id])
+
+        page, per_page = pagination_params
+        @users = @segment.users.joins(:profile).select(USER_ATTRIBUTES_FOR_SERIALIZATION).page(page).per(per_page)
+      end
+
       def add_users
         @segment = scope.find(params[:id])
 
@@ -50,6 +75,14 @@ module Api
         render json: { error: "Too many user IDs provided" }, status: :unprocessable_entity
       end
 
+      def pagination_params
+        per_page_param = params[:per_page] || DEFAULT_PER_PAGE
+        max_per_page = ApplicationConfig["API_PER_PAGE_MAX"] || 1000
+        per_page = [per_page_param, max_per_page].map(&:to_i).min
+
+        [params[:page].to_i, per_page]
+      end
+
       def scope
         AudienceSegment.manual
       end
diff --git a/app/models/audience_segment.rb b/app/models/audience_segment.rb
index e5bbe34ae..ae8be7ccf 100644
--- a/app/models/audience_segment.rb
+++ b/app/models/audience_segment.rb
@@ -58,6 +58,12 @@ class AudienceSegment < ApplicationRecord
       .map { |(id, type)| [I18n.t("models.#{model_name.i18n_key}.type_ofs.#{type}"), id] }
   end
 
+  def self.including_user_counts
+    left_joins(:segmented_users)
+      .select("audience_segments.*, COUNT(segmented_users.id) AS user_count")
+      .group("audience_segments.id")
+  end
+
   def persist_recently_active_users
     self.users = self.class.recently_active_users_in_segment(type_of)
   end
diff --git a/app/views/api/v1/audience_segments/users.json.jbuilder b/app/views/api/v1/audience_segments/users.json.jbuilder
new file mode 100644
index 000000000..c901adcb9
--- /dev/null
+++ b/app/views/api/v1/audience_segments/users.json.jbuilder
@@ -0,0 +1,3 @@
+json.array! @users do |user|
+  json.partial! "api/v1/shared/user_show", user: user
+end
diff --git a/config/routes.rb b/config/routes.rb
index 7206fe2eb..5f73cdffd 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -55,7 +55,8 @@ Rails.application.routes.draw do
           put "unpublish", on: :member
         end
 
-        resources :segments, controller: "audience_segments", only: %i[create destroy] do
+        resources :segments, controller: "audience_segments", only: %i[index show create destroy] do
+          get "users", on: :member
           put "add_users", on: :member
           put "remove_users", on: :member
         end
diff --git a/spec/requests/api/v1/audience_segments_spec.rb b/spec/requests/api/v1/audience_segments_spec.rb
index 25a121be8..1972121a9 100644
--- a/spec/requests/api/v1/audience_segments_spec.rb
+++ b/spec/requests/api/v1/audience_segments_spec.rb
@@ -46,6 +46,87 @@ RSpec.describe "Api::V1::AudienceSegments" do
     end
   end
 
+  describe "GET /api/segments" do
+    subject(:make_request) { get api_segments_path, headers: headers }
+
+    let(:first_manual_segment) { AudienceSegment.create!(type_of: "manual") }
+    let(:second_manual_segment) { AudienceSegment.create!(type_of: "manual") }
+    let(:automatic_segment) { AudienceSegment.create!(type_of: "trusted") }
+    let(:users) { create_list(:user, 3) }
+
+    it_behaves_like "an admin-only protected resource"
+
+    it "returns only manual segments including their user counts" do
+      first_manual_segment.users << users
+      expected_data = [
+        hash_including(
+          "id" => first_manual_segment.id,
+          "type_of" => "manual",
+          "user_count" => 3,
+        ),
+        hash_including(
+          "id" => second_manual_segment.id,
+          "type_of" => "manual",
+          "user_count" => 0,
+        ),
+      ]
+      excluded_data = hash_including("id" => automatic_segment.id)
+
+      make_request
+
+      expect(response).to have_http_status(:success)
+      expect(response.media_type).to eq("application/json")
+
+      expect(response.parsed_body).to include(*expected_data)
+      expect(response.parsed_body).not_to include(excluded_data)
+    end
+
+    it "supports pagination" do
+      5.times.each { AudienceSegment.create!(type_of: :manual) }
+
+      get api_segments_path, params: { page: 1, per_page: 3 }, headers: headers
+      expect(response.parsed_body.length).to eq(3)
+      get api_segments_path, params: { page: 2, per_page: 4 }, headers: headers
+      expect(response.parsed_body.length).to eq(1)
+    end
+
+    it "respects API_PER_PAGE_MAX env variable limit" do
+      5.times.each { AudienceSegment.create!(type_of: :manual) }
+
+      allow(ApplicationConfig).to receive(:[]).and_return(nil)
+      allow(ApplicationConfig).to receive(:[]).with("APP_PROTOCOL").and_return("http://")
+      allow(ApplicationConfig).to receive(:[]).with("API_PER_PAGE_MAX").and_return(3)
+
+      get api_segments_path, params: { per_page: 10 }, headers: headers
+      expect(response.parsed_body.length).to eq(3)
+    end
+  end
+
+  describe "GET /api/segments/:id" do
+    subject(:make_request) { get api_segment_path(segment.id), headers: headers }
+
+    let(:segment) { AudienceSegment.create!(type_of: "manual") }
+    let(:users) { create_list(:user, 3) }
+
+    it_behaves_like "an admin-only protected resource"
+
+    it_behaves_like "an endpoint for only manual audience segments"
+
+    it "returns the segment including its user count" do
+      segment.users << users
+
+      make_request
+
+      expect(response).to have_http_status(:success)
+      expect(response.media_type).to eq("application/json")
+      expect(response.parsed_body).to include(
+        "id" => segment.id,
+        "type_of" => "manual",
+        "user_count" => 3,
+      )
+    end
+  end
+
   describe "POST /api/segments" do
     subject(:make_request) { post api_segments_path, headers: headers }
 
@@ -66,6 +147,60 @@ RSpec.describe "Api::V1::AudienceSegments" do
     end
   end
 
+  describe "GET /api/segments/:id/users" do
+    subject(:make_request) { get users_api_segment_path(segment.id), headers: headers }
+
+    let(:segment) { AudienceSegment.create!(type_of: "manual") }
+    let(:users) { create_list(:user, 5) }
+
+    it_behaves_like "an admin-only protected resource"
+
+    it_behaves_like "an endpoint for only manual audience segments"
+
+    it "returns a list of users in the segment" do
+      segment.users << users
+
+      expected_data = users.map do |user|
+        hash_including(
+          "id" => user.id,
+          "username" => user.username,
+          "name" => user.name,
+          "twitter_username" => user.twitter_username,
+          "github_username" => user.github_username,
+          "summary" => user.profile.summary,
+          "location" => user.profile.location,
+          "website_url" => user.profile.website_url,
+        )
+      end
+
+      make_request
+
+      expect(response).to have_http_status(:success)
+      expect(response.media_type).to eq("application/json")
+      expect(response.parsed_body).to match_array(expected_data)
+    end
+
+    it "supports pagination" do
+      segment.users << users
+
+      get users_api_segment_path(segment.id), params: { page: 1, per_page: 3 }, headers: headers
+      expect(response.parsed_body.length).to eq(3)
+      get users_api_segment_path(segment.id), params: { page: 2, per_page: 4 }, headers: headers
+      expect(response.parsed_body.length).to eq(1)
+    end
+
+    it "respects API_PER_PAGE_MAX env variable limit" do
+      segment.users << users
+
+      allow(ApplicationConfig).to receive(:[]).and_return(nil)
+      allow(ApplicationConfig).to receive(:[]).with("APP_PROTOCOL").and_return("http://")
+      allow(ApplicationConfig).to receive(:[]).with("API_PER_PAGE_MAX").and_return(3)
+
+      get users_api_segment_path(segment.id), params: { per_page: 5 }, headers: headers
+      expect(response.parsed_body.length).to eq(3)
+    end
+  end
+
   describe "PUT /api/segments/:id/add_users" do
     subject(:make_request) do
       put add_users_api_segment_path(segment.id), params: { user_ids: user_ids }, headers: headers, as: :json
diff --git a/spec/requests/api/v1/docs/audience_segments_spec.rb b/spec/requests/api/v1/docs/audience_segments_spec.rb
index 00fbc75f7..e34ec345a 100644
--- a/spec/requests/api/v1/docs/audience_segments_spec.rb
+++ b/spec/requests/api/v1/docs/audience_segments_spec.rb
@@ -25,11 +25,59 @@ RSpec.describe "Api::V1::Docs::AudienceSegments" do
     admin_api_secret.user.add_role(:admin)
   end
 
-  describe "POST /segments" do
-    path "/api/segments" do
+  path "/api/segments" do
+    describe "GET /segments" do
+      get "Manually managed audience segments" do
+        tags "segments"
+        description "This endpoint allows the client to retrieve a list of audience segments.
+
+An audience segment is a group of users that can be targeted by a Billboard. This API only permits managing segments you create and maintain yourself.
+
+The endpoint supports pagination, and each page will contain `30` segments by default."
+        operationId "getSegments"
+        produces "application/json"
+        consumes "application/json"
+
+        parameter "$ref": "#/components/parameters/perPageParam30to1000"
+
+        response "200", "A List of manually managed audience segments" do
+          let(:"api-key") { admin_api_secret.secret }
+          let(:second_segment) { AudienceSegment.create!(type_of: "manual") }
+          schema  type: :array,
+                  items: { "$ref": "#/components/schemas/Segment" }
+
+          before do
+            segment.users << users
+            second_segment.users << create(:user)
+          end
+
+          add_examples
+
+          run_test!
+        end
+
+        response "401", "Unauthorized" do
+          let(:"api-key") { nil }
+
+          add_examples
+
+          run_test!
+        end
+
+        response "401", "Unauthorized" do
+          let(:"api-key") { regular_api_secret.secret }
+
+          add_examples
+
+          run_test!
+        end
+      end
+    end
+
+    describe "POST /segments" do
       post "Create a manually managed audience segment" do
         tags "segments"
-        description "This endpoint allows the client to create a new audience segment.\n\nAn audience segment is a group of users that can be targeted by a DisplayAd/Billboard/Widget. This API only permits managing segments you create and maintain yourself."
+        description "This endpoint allows the client to create a new audience segment.\n\nAn audience segment is a group of users that can be targeted by a Billboard. This API only permits managing segments you create and maintain yourself."
         operationId "createSegment"
         produces "application/json"
         consumes "application/json"
@@ -61,11 +109,65 @@ RSpec.describe "Api::V1::Docs::AudienceSegments" do
     end
   end
 
-  describe "DELETE /segments/:id" do
-    path "/api/segments/{id}" do
+  path "/api/segments/{id}" do
+    describe "GET /segments/:id" do
+      get "A manually managed audience segment" do
+        tags "segments"
+        description "This endpoint allows the client to retrieve a single manually-managed audience segment specified by ID."
+        operationId "getSegment"
+        produces "application/json"
+        consumes "application/json"
+
+        parameter name: :id, in: :path, required: true, schema: id_schema
+
+        response "200", "The audience segment" do
+          let(:"api-key") { admin_api_secret.secret }
+          let(:id) { segment.id }
+          schema  type: :object,
+                  items: { "$ref": "#/components/schemas/Segment" }
+
+          before do
+            segment.users << users
+          end
+
+          add_examples
+
+          run_test!
+        end
+
+        response "401", "Unauthorized" do
+          let(:"api-key") { nil }
+          let(:id) { segment.id }
+
+          add_examples
+
+          run_test!
+        end
+
+        response "401", "Unauthorized" do
+          let(:"api-key") { regular_api_secret.secret }
+          let(:id) { segment.id }
+
+          add_examples
+
+          run_test!
+        end
+
+        response "404", "Audience Segment Not Found" do
+          let(:"api-key") { admin_api_secret.secret }
+          let(:id) { automatic_segment.id }
+
+          add_examples
+
+          run_test!
+        end
+      end
+    end
+
+    describe "DELETE /segments/:id" do
       delete "Delete a manually managed audience segment" do
         tags "segments"
-        description "This endpoint allows the client to delete an audience segment specified by ID.\n\nAudience segments cannot be deleted if there are still any DisplayAds/Billboards/Widgets using them."
+        description "This endpoint allows the client to delete an audience segment specified by ID.\n\nAudience segments cannot be deleted if there are still any Billboards using them."
         operationId "deleteSegment"
         produces "application/json"
         consumes "application/json"
@@ -125,6 +227,63 @@ RSpec.describe "Api::V1::Docs::AudienceSegments" do
     end
   end
 
+  describe "GET /segments/:id/users" do
+    path "/api/segments/{id}/users" do
+      get "Users in a manually managed audience segment" do
+        tags "segments"
+        description "This endpoint allows the client to retrieve a list of the users in an audience segment specified by ID. The endpoint supports pagination, and each page will contain `30` users by default."
+        operationId "getUsersInSegment"
+        produces "application/json"
+        consumes "application/json"
+
+        parameter name: :id, in: :path, required: true, schema: id_schema
+        parameter "$ref": "#/components/parameters/perPageParam30to1000"
+
+        response "200", "A List of users in the audience segment" do
+          let(:"api-key") { admin_api_secret.secret }
+          let(:id) { segment.id }
+          schema  type: :array,
+                  items: { "$ref": "#/components/schemas/User" }
+
+          before do
+            segment.users << users
+          end
+
+          add_examples
+
+          run_test!
+        end
+
+        response "401", "Unauthorized" do
+          let(:"api-key") { nil }
+          let(:id) { segment.id }
+
+          add_examples
+
+          run_test!
+        end
+
+        response "401", "Unauthorized" do
+          let(:"api-key") { regular_api_secret.secret }
+          let(:id) { segment.id }
+
+          add_examples
+
+          run_test!
+        end
+
+        response "404", "Audience Segment Not Found" do
+          let(:"api-key") { admin_api_secret.secret }
+          let(:id) { automatic_segment.id }
+
+          add_examples
+
+          run_test!
+        end
+      end
+    end
+  end
+
   describe "PUT /segments/:id/add_users" do
     path "/api/segments/{id}/add_users" do
       put "Add users to a manually managed audience segment" do
diff --git a/swagger/v1/api_v1.json b/swagger/v1/api_v1.json
index dce343612..53bb22bcd 100644
--- a/swagger/v1/api_v1.json
+++ b/swagger/v1/api_v1.json
@@ -929,10 +929,63 @@
       }
     },
     "/api/segments": {
+      "get": {
+        "summary": "Manually managed audience segments",
+        "tags": ["segments"],
+        "description": "This endpoint allows the client to retrieve a list of audience segments.\n\nAn audience segment is a group of users that can be targeted by a Billboard. This API only permits managing segments you create and maintain yourself.\n\nThe endpoint supports pagination, and each page will contain `30` segments by default.",
+        "operationId": "getSegments",
+        "parameters": [
+          {
+            "$ref": "#/components/parameters/perPageParam30to1000"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "A List of manually managed audience segments",
+            "content": {
+              "application/json": {
+                "example": [
+                  {
+                    "id": 127,
+                    "created_at": "2023-05-19T13:29:19.013-05:00",
+                    "type_of": "manual",
+                    "updated_at": "2023-05-19T13:29:19.013-05:00",
+                    "user_count": 1
+                  },
+                  {
+                    "id": 126,
+                    "created_at": "2023-05-19T13:29:19.013-05:00",
+                    "type_of": "manual",
+                    "updated_at": "2023-05-19T13:29:19.013-05:00",
+                    "user_count": 3
+                  }
+                ],
+                "schema": {
+                  "type": "array",
+                  "items": {
+                    "$ref": "#/components/schemas/Segment"
+                  }
+                }
+              }
+            }
+          },
+          "401": {
+            "description": "Unauthorized",
+            "content": {
+              "application/json": {
+                "example": {
+                  "error": "unauthorized",
+                  "status": 401
+                }
+              }
+            }
+          }
+        }
+      },
       "post": {
         "summary": "Create a manually managed audience segment",
         "tags": ["segments"],
-        "description": "This endpoint allows the client to create a new audience segment.\n\nAn audience segment is a group of users that can be targeted by a DisplayAd/Billboard/Widget. This API only permits managing segments you create and maintain yourself.",
+        "description": "This endpoint allows the client to create a new audience segment.\n\nAn audience segment is a group of users that can be targeted by a Billboard. This API only permits managing segments you create and maintain yourself.",
         "operationId": "createSegment",
         "responses": {
           "201": {
@@ -963,10 +1016,72 @@
       }
     },
     "/api/segments/{id}": {
+      "get": {
+        "summary": "A manually managed audience segment",
+        "tags": ["segments"],
+        "description": "This endpoint allows the client to retrieve a single manually-managed audience segment specified by ID.",
+        "operationId": "getSegment",
+        "parameters": [
+          {
+            "name": "id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "integer",
+              "format": "int32",
+              "minimum": 1
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The audience segment",
+            "content": {
+              "application/json": {
+                "example": {
+                  "id": 131,
+                  "created_at": "2023-05-19T13:29:19.481-05:00",
+                  "type_of": "manual",
+                  "updated_at": "2023-05-19T13:29:19.481-05:00",
+                  "user_count": 3
+                },
+                "schema": {
+                  "type": "object",
+                  "items": {
+                    "$ref": "#/components/schemas/Segment"
+                  }
+                }
+              }
+            }
+          },
+          "401": {
+            "description": "Unauthorized",
+            "content": {
+              "application/json": {
+                "example": {
+                  "error": "unauthorized",
+                  "status": 401
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "Audience Segment Not Found",
+            "content": {
+              "application/json": {
+                "example": {
+                  "error": "not found",
+                  "status": 404
+                }
+              }
+            }
+          }
+        }
+      },
       "delete": {
         "summary": "Delete a manually managed audience segment",
         "tags": ["segments"],
-        "description": "This endpoint allows the client to delete an audience segment specified by ID.\n\nAudience segments cannot be deleted if there are still any DisplayAds/Billboards/Widgets using them.",
+        "description": "This endpoint allows the client to delete an audience segment specified by ID.\n\nAudience segments cannot be deleted if there are still any Billboards using them.",
         "operationId": "deleteSegment",
         "parameters": [
           {
@@ -1029,6 +1144,107 @@
         }
       }
     },
+    "/api/segments/{id}/users": {
+      "get": {
+        "summary": "Users in a manually managed audience segment",
+        "tags": ["segments"],
+        "description": "This endpoint allows the client to retrieve a list of the users in an audience segment specified by ID. The endpoint supports pagination, and each page will contain `30` users by default.",
+        "operationId": "getUsersInSegment",
+        "parameters": [
+          {
+            "name": "id",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "integer",
+              "format": "int32",
+              "minimum": 1
+            }
+          },
+          {
+            "$ref": "#/components/parameters/perPageParam30to1000"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "A List of users in the audience segment",
+            "content": {
+              "application/json": {
+                "example": [
+                  {
+                    "type_of": "user",
+                    "id": 1032,
+                    "username": "username586",
+                    "name": "Katrina \"Kirsten\" \\:/ Schiller",
+                    "twitter_username": "twitter586",
+                    "github_username": "github586",
+                    "summary": null,
+                    "location": null,
+                    "website_url": null,
+                    "joined_at": "May 19, 2023",
+                    "profile_image": "/uploads/user/profile_image/1947/02641cc1-4268-4203-8f2d-59cf53d4433a.jpeg"
+                  },
+                  {
+                    "type_of": "user",
+                    "id": 1033,
+                    "username": "username587",
+                    "name": "Breanne \"Steve\" \\:/ Marquardt",
+                    "twitter_username": "twitter587",
+                    "github_username": "github587",
+                    "summary": null,
+                    "location": null,
+                    "website_url": null,
+                    "joined_at": "May 19, 2023",
+                    "profile_image": "/uploads/user/profile_image/1948/621613c2-2990-4b92-8a26-8dac49725a95.jpeg"
+                  },
+                  {
+                    "type_of": "user",
+                    "id": 1034,
+                    "username": "username588",
+                    "name": "Eugene \"Jamar\" \\:/ Keebler",
+                    "twitter_username": "twitter588",
+                    "github_username": "github588",
+                    "summary": null,
+                    "location": null,
+                    "website_url": null,
+                    "joined_at": "May 19, 2023",
+                    "profile_image": "/uploads/user/profile_image/1949/7d5a54bc-faf2-408b-a988-3ea5b8ef40f1.jpeg"
+                  }
+                ],
+                "schema": {
+                  "type": "array",
+                  "items": {
+                    "$ref": "#/components/schemas/User"
+                  }
+                }
+              }
+            }
+          },
+          "401": {
+            "description": "Unauthorized",
+            "content": {
+              "application/json": {
+                "example": {
+                  "error": "unauthorized",
+                  "status": 401
+                }
+              }
+            }
+          },
+          "404": {
+            "description": "Audience Segment Not Found",
+            "content": {
+              "application/json": {
+                "example": {
+                  "error": "not found",
+                  "status": 404
+                }
+              }
+            }
+          }
+        }
+      }
+    },
     "/api/segments/{id}/add_users": {
       "put": {
         "summary": "Add users to a manually managed audience segment",