diff --git a/app/controllers/stories_controller.rb b/app/controllers/stories_controller.rb
index dc1f35e34..807b6bb4b 100644
--- a/app/controllers/stories_controller.rb
+++ b/app/controllers/stories_controller.rb
@@ -236,6 +236,7 @@ class StoriesController < ApplicationController
     # 2nd with 1 badge (!) <-- and that would look off.
     @badges_limit = 6
     @profile = @user.profile.decorate
+    @is_user_flagged = Reaction.where(user_id: session_current_user_id, reactable: @user).any?
 
     set_surrogate_key_header "articles-user-#{@user.id}"
     set_user_json_ld
diff --git a/app/javascript/packs/profileDropdown.js b/app/javascript/packs/profileDropdown.js
index 3d8338083..6e0c35664 100644
--- a/app/javascript/packs/profileDropdown.js
+++ b/app/javascript/packs/profileDropdown.js
@@ -1,7 +1,13 @@
 import { initBlock } from '../profileDropdown/blockButton';
+import { initFlag } from '../profileDropdown/flagButton';
+
+function initButtons() {
+  initBlock();
+  initFlag();
+}
 
 window.InstantClick.on('change', () => {
-  initBlock();
+  initButtons();
 });
 
-initBlock();
+initButtons();
diff --git a/app/javascript/profileDropdown/flagButton.js b/app/javascript/profileDropdown/flagButton.js
new file mode 100644
index 000000000..1cd76ecd4
--- /dev/null
+++ b/app/javascript/profileDropdown/flagButton.js
@@ -0,0 +1,67 @@
+/* global userData */
+/* eslint-disable no-alert */
+/**
+ * Adds a flag button visible only to trusted users on profile pages.
+ * @function initFlag
+ * @returns {(void|undefined)} This function has no useable return value.
+ */
+export function initFlag() {
+  const flagButton = document.getElementById(
+    'user-profile-dropdownmenu-flag-button',
+  );
+
+  if (!flagButton) {
+    // button not always present when this is called
+    return;
+  }
+
+  const user = userData();
+  if (!user) {
+    return;
+  }
+
+  const { profileUserId, profileUserName } = flagButton.dataset;
+  let isUserFlagged = flagButton.dataset.isUserFlagged === 'true';
+  const trustedOrAdmin = user.trusted || user.admin;
+
+  if (!trustedOrAdmin || user.id === parseInt(profileUserId, 10)) {
+    flagButton.remove();
+  }
+
+  function flag() {
+    const confirmFlag = window.confirm(
+      isUserFlagged
+        ? 'Are you sure you want to unflag this person? This will make all of their posts visible again.'
+        : 'Are you sure you want to flag this person? This will make all of their posts less visible.',
+    );
+
+    if (confirmFlag) {
+      fetch('/reactions', {
+        method: 'POST',
+        headers: {
+          'X-CSRF-Token': window.csrfToken,
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({
+          reactable_type: 'User',
+          category: 'vomit',
+          reactable_id: profileUserId,
+        }),
+      })
+        .then((response) => response.json())
+        .then((response) => {
+          if (response.result === 'create') {
+            isUserFlagged = true;
+            flagButton.innerHTML = `Unflag ${profileUserName}`;
+          } else {
+            isUserFlagged = false;
+            flagButton.innerHTML = `Flag ${profileUserName}`;
+          }
+        })
+        .catch((e) => window.alert(`Something went wrong: ${e}`));
+    }
+  }
+
+  flagButton.addEventListener('click', flag);
+}
+/* eslint-enable no-alert */
diff --git a/app/views/users/show.html.erb b/app/views/users/show.html.erb
index 746fffdc2..58690a59b 100644
--- a/app/views/users/show.html.erb
+++ b/app/views/users/show.html.erb
@@ -33,8 +33,17 @@
               </button>
 
               <div id="user-profile-dropdownmenu" class="crayons-dropdown top-100 right-0 p-1">
-                <a href="javascript:void(0);" id="user-profile-dropdownmenu-block-button" data-profile-user-id="<%= @user.id %>" class="border-none crayons-link crayons-link--block">Block @<%= @user.username %></a>
                 <% if user_signed_in? %>
+                  <a href="javascript:void(0);" id="user-profile-dropdownmenu-block-button" data-profile-user-id="<%= @user.id %>" class="border-none crayons-link crayons-link--block">Block @<%= @user.username %></a>
+                  <a
+                    href="javascript:void(0);"
+                    id="user-profile-dropdownmenu-flag-button"
+                    data-profile-user-id="<%= @user.id %>"
+                    data-profile-user-name="@<%= @user.username %>"
+                    data-is-user-flagged="<%= @is_user_flagged %>"
+                    class="border-none crayons-link crayons-link--block">
+                    <%= @flag_status ? "Unflag" : "Flag" %> @<%= @user.username %>
+                  </a>
                   <%= javascript_packs_with_chunks_tag "profileDropdown", defer: true %>
                 <% end %>
                 <span class="report-abuse-link-wrapper" data-path="/report-abuse?url=<%= user_url(@user) %>"></span>
@@ -75,9 +84,9 @@
             <% end %>
             <span class="profile-header__meta__item -ml-1">
               <% Profile.special_social_link_attributes.each do |attribute| %>
-                <% if @user.send(attribute).present? %>
-                  <a href="<%= @user.send(attribute) %>" target="_blank" rel="noopener me" class="px-1 align-middle inline-block">
-                    <%= inline_svg_tag("#{attribute.gsub("_url","")}.svg", class: "crayons-icon", aria: true, title: "#{attribute.split("_").first.titleize} logo") %>
+                <% if @user.public_send(attribute).present? %>
+                  <a href="<%= @user.public_send(attribute) %>" target="_blank" rel="noopener me" class="px-1 align-middle inline-block">
+                    <%= inline_svg_tag("#{attribute.gsub('_url', '')}.svg", class: "crayons-icon", aria: true, title: "#{attribute.split('_').first.titleize} logo") %>
                   </a>
                 <% end %>
               <% end %>
diff --git a/spec/requests/reactions_spec.rb b/spec/requests/reactions_spec.rb
index b2f46ad84..2929220e8 100644
--- a/spec/requests/reactions_spec.rb
+++ b/spec/requests/reactions_spec.rb
@@ -190,17 +190,20 @@ RSpec.describe "Reactions", type: :request do
     context "when reacting to an article" do
       before do
         sign_in user
-        post "/reactions", params: article_params
       end
 
       it "creates reaction" do
-        expect(Reaction.last.reactable_id).to eq(article.id)
+        expect do
+          post "/reactions", params: article_params
+        end.to change(Reaction, :count).by(1)
       end
 
       it "destroys existing reaction" do
-        # same route to destroy, so sending POST request again
         post "/reactions", params: article_params
-        expect(Reaction.all.size).to eq(0)
+        expect do
+          # same route to destroy, so sending POST request again
+          post "/reactions", params: article_params
+        end.to change(Reaction, :count).by(-1)
       end
     end
 
@@ -270,17 +273,19 @@ RSpec.describe "Reactions", type: :request do
     context "when vomiting on a user" do
       before do
         sign_in trusted_user
-        post "/reactions", params: user_params
       end
 
       it "creates reaction" do
-        expect(Reaction.last.reactable_id).to eq(user.id)
+        expect do
+          post "/reactions", params: user_params
+        end.to change(Reaction, :count).by(1)
       end
 
       it "destroys existing reaction" do
-        # same route to destroy, so sending POST request again
         post "/reactions", params: user_params
-        expect(Reaction.all.size).to eq(0)
+        expect do
+          post "/reactions", params: user_params
+        end.to change(Reaction, :count).by(-1)
       end
     end
 
diff --git a/spec/system/user/trusted_user_flags_user_spec.rb b/spec/system/user/trusted_user_flags_user_spec.rb
new file mode 100644
index 000000000..82f5aacee
--- /dev/null
+++ b/spec/system/user/trusted_user_flags_user_spec.rb
@@ -0,0 +1,43 @@
+require "rails_helper"
+
+RSpec.describe "Flagging users from profile pages", type: :system, js: true do
+  let(:user) { create :user }
+  let(:flag_text) { "Flag @#{user.username}" }
+
+  context "when not logged in" do
+    it "does not show the flag button" do
+      visit user_profile_path(user.username)
+      click_button(id: "user-profile-dropdown")
+      expect(page).not_to have_link(flag_text)
+    end
+  end
+
+  context "when signed in as a non-trusted user" do
+    it "does not show the flag button" do
+      sign_in create(:user)
+
+      visit user_profile_path(user.username)
+      click_button(id: "user-profile-dropdown")
+      expect(page).not_to have_link(flag_text)
+    end
+  end
+
+  context "when signed in as the user" do
+    it "does not show a button for flagging yourself" do
+      sign_in user
+
+      visit user_profile_path(user.username)
+      expect(page).not_to have_selector("user-profile-dropdown")
+    end
+  end
+
+  context "when signed in as a trusted user" do
+    it "allows toggling the flagged status" do
+      sign_in create(:user, :trusted)
+
+      visit user_profile_path(user.username)
+      click_button(id: "user-profile-dropdown")
+      expect(page).to have_link(flag_text)
+    end
+  end
+end