diff --git a/app/assets/javascripts/discourse/components/user-card-contents.js.es6 b/app/assets/javascripts/discourse/components/user-card-contents.js.es6
index d13fcd101c1..4849a917af8 100644
--- a/app/assets/javascripts/discourse/components/user-card-contents.js.es6
+++ b/app/assets/javascripts/discourse/components/user-card-contents.js.es6
@@ -195,6 +195,16 @@ export default Ember.Component.extend(
         this._close();
       },
 
+      ignoreUser() {
+        this.get("user").ignore();
+        this._close();
+      },
+
+      watchUser() {
+        this.get("user").watch();
+        this._close();
+      },
+
       showUser() {
         this.showUser(this.get("user"));
         this._close();
diff --git a/app/assets/javascripts/discourse/controllers/user.js.es6 b/app/assets/javascripts/discourse/controllers/user.js.es6
index e0b31bd1727..d6f577fe37f 100644
--- a/app/assets/javascripts/discourse/controllers/user.js.es6
+++ b/app/assets/javascripts/discourse/controllers/user.js.es6
@@ -145,6 +145,16 @@ export default Ember.Controller.extend(CanCheckEmails, {
 
     adminDelete() {
       this.get("adminTools").deleteUser(this.get("model.id"));
+    },
+
+    ignoreUser() {
+      const user = this.get("model");
+      user.ignore().then(() => user.set("ignored", true));
+    },
+
+    watchUser() {
+      const user = this.get("model");
+      user.watch().then(() => user.set("ignored", false));
     }
   }
 });
diff --git a/app/assets/javascripts/discourse/models/user.js.es6 b/app/assets/javascripts/discourse/models/user.js.es6
index 428f08ba5bf..ab7f31538d6 100644
--- a/app/assets/javascripts/discourse/models/user.js.es6
+++ b/app/assets/javascripts/discourse/models/user.js.es6
@@ -615,6 +615,20 @@ const User = RestModel.extend({
     }
   },
 
+  ignore() {
+    return ajax(`${userPath(this.get("username"))}/ignore.json`, {
+      type: "PUT",
+      data: { ignored_user_id: this.get("id") }
+    });
+  },
+
+  watch() {
+    return ajax(`${userPath(this.get("username"))}/ignore.json`, {
+      type: "DELETE",
+      data: { ignored_user_id: this.get("id") }
+    });
+  },
+
   dismissBanner(bannerKey) {
     this.set("dismissed_banner_key", bannerKey);
     ajax(userPath(this.get("username") + ".json"), {
diff --git a/app/assets/javascripts/discourse/templates/components/user-card-contents.hbs b/app/assets/javascripts/discourse/templates/components/user-card-contents.hbs
index a7fc8cac358..e40a5a2abe6 100644
--- a/app/assets/javascripts/discourse/templates/components/user-card-contents.hbs
+++ b/app/assets/javascripts/discourse/templates/components/user-card-contents.hbs
@@ -48,6 +48,21 @@
             icon="envelope"
             label="user.private_message"}}
         </li>
+        {{#if user.can_ignore_user}}
+          <li>
+            {{#if user.ignored}}
+              {{d-button class="btn-default"
+                         action=(action "watchUser")
+                         icon="eye"
+                         label="user.watch"}}
+            {{else}}
+              {{d-button class="btn-danger"
+                         action=(action "ignoreUser")
+                         icon="eye-slash"
+                         label="user.ignore"}}
+            {{/if}}
+          </li>
+        {{/if}}
       {{/if}}
 
       {{#if showFilter}}
diff --git a/app/assets/javascripts/discourse/templates/user.hbs b/app/assets/javascripts/discourse/templates/user.hbs
index 0376714d9ad..755d9090f1f 100644
--- a/app/assets/javascripts/discourse/templates/user.hbs
+++ b/app/assets/javascripts/discourse/templates/user.hbs
@@ -43,12 +43,27 @@
           <section class='controls'>
             <ul>
               {{#if model.can_send_private_message_to_user}}
-              <li>
-                {{d-button class="btn btn-primary compose-pm"
-                  action=(route-action "composePrivateMessage" model)
-                  icon="envelope"
-                  label="user.private_message"}}
-              </li>
+                <li>
+                  {{d-button class="btn-primary compose-pm"
+                    action=(route-action "composePrivateMessage" model)
+                    icon="envelope"
+                    label="user.private_message"}}
+                </li>
+                {{#if model.can_ignore_user}}
+                  <li>
+                  {{#if model.ignored}}
+                    {{d-button class="btn-default"
+                               action=(action "watchUser")
+                               icon="eye"
+                               label="user.watch"}}
+                  {{else}}
+                    {{d-button class="btn-danger"
+                               action=(action "ignoreUser")
+                               icon="eye-slash"
+                               label="user.ignore"}}
+                  {{/if}}
+                  </li>
+                {{/if}}
               {{/if}}
               {{#if currentUser.staff}}
                 <li><a href={{model.adminPath}} class="btn btn-default">{{d-icon "wrench"}}{{i18n 'admin.user.show_admin_profile'}}</a></li>
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index be2ba574f5f..81d6ea8963c 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -14,7 +14,7 @@ class UsersController < ApplicationController
     :pick_avatar, :destroy_user_image, :destroy, :check_emails,
     :topic_tracking_state, :preferences, :create_second_factor,
     :update_second_factor, :create_second_factor_backup, :select_avatar,
-    :revoke_auth_token
+    :ignore, :watch, :revoke_auth_token
   ]
 
   skip_before_action :check_xhr, only: [
@@ -995,6 +995,22 @@ class UsersController < ApplicationController
     render json: success_json
   end
 
+  def ignore
+    raise Discourse::NotFound unless SiteSetting.ignore_user_enabled
+
+    ::IgnoredUser.find_or_create_by!(
+      user: current_user,
+      ignored_user_id: params[:ignored_user_id])
+    render json: success_json
+  end
+
+  def watch
+    raise Discourse::NotFound unless SiteSetting.ignore_user_enabled
+
+    IgnoredUser.where(user: current_user, ignored_user_id: params[:ignored_user_id]).delete_all
+    render json: success_json
+  end
+
   def read_faq
     if user = current_user
       user.user_stat.read_faq = 1.second.ago
diff --git a/app/models/ignored_user.rb b/app/models/ignored_user.rb
new file mode 100644
index 00000000000..34c6bdc995b
--- /dev/null
+++ b/app/models/ignored_user.rb
@@ -0,0 +1,20 @@
+class IgnoredUser < ActiveRecord::Base
+  belongs_to :user
+  belongs_to :ignored_user, class_name: "User"
+end
+
+# == Schema Information
+#
+# Table name: ignored_users
+#
+#  id            :integer          not null, primary key
+#  user_id       :integer          not null
+#  ignored_user_id :integer          not null
+#  created_at    :datetime         not null
+#  updated_at    :datetime         not null
+#
+# Indexes
+#
+#  index_ignored_users_on_ignored_user_id_and_user_id  (ignored_user_id,user_id) UNIQUE
+#  index_ignored_users_on_user_id_and_ignored_user_id  (user_id,ignored_user_id) UNIQUE
+#
diff --git a/app/serializers/user_serializer.rb b/app/serializers/user_serializer.rb
index 325f4dd3f8e..7f30eadbb0c 100644
--- a/app/serializers/user_serializer.rb
+++ b/app/serializers/user_serializer.rb
@@ -49,6 +49,8 @@ class UserSerializer < BasicUserSerializer
              :can_edit_email,
              :can_edit_name,
              :stats,
+             :ignored,
+             :can_ignore_user,
              :can_send_private_messages,
              :can_send_private_message_to_user,
              :bio_excerpt,
@@ -274,6 +276,14 @@ class UserSerializer < BasicUserSerializer
     UserAction.stats(object.id, scope)
   end
 
+  def ignored
+    IgnoredUser.where(user_id: scope.user&.id, ignored_user_id: object.id).exists?
+  end
+
+  def can_ignore_user
+    SiteSetting.ignore_user_enabled
+  end
+
   # Needed because 'send_private_message_to_user' will always return false
   # when the current user is being serialized
   def can_send_private_messages
diff --git a/config/locales/client.en.yml b/config/locales/client.en.yml
index 65d4c0d891c..ffc3400f485 100644
--- a/config/locales/client.en.yml
+++ b/config/locales/client.en.yml
@@ -636,6 +636,8 @@ en:
       new_private_message: "New Message"
       private_message: "Message"
       private_messages: "Messages"
+      ignore: "Ignore"
+      watch: "Watch"
       activity_stream: "Activity"
       preferences: "Preferences"
       profile_hidden: "This user's public profile is hidden."
diff --git a/config/routes.rb b/config/routes.rb
index 820b6d74243..d3ec4656fdb 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -421,6 +421,8 @@ Discourse::Application.routes.draw do
     post "#{root_path}/:username/preferences/revoke-auth-token" => "users#revoke_auth_token", constraints: { username: RouteFormat.username }
     get "#{root_path}/:username/staff-info" => "users#staff_info", constraints: { username: RouteFormat.username }
     get "#{root_path}/:username/summary" => "users#summary", constraints: { username: RouteFormat.username }
+    put "#{root_path}/:username/ignore" => "users#ignore", constraints: { username: RouteFormat.username }
+    delete "#{root_path}/:username/ignore" => "users#watch", constraints: { username: RouteFormat.username }
     get "#{root_path}/:username/invited" => "users#invited", constraints: { username: RouteFormat.username }
     get "#{root_path}/:username/invited_count" => "users#invited_count", constraints: { username: RouteFormat.username }
     get "#{root_path}/:username/invited/:filter" => "users#invited", constraints: { username: RouteFormat.username }
diff --git a/config/site_settings.yml b/config/site_settings.yml
index 7bdcc2ac667..ed2aedae39b 100644
--- a/config/site_settings.yml
+++ b/config/site_settings.yml
@@ -529,6 +529,9 @@ users:
     default: false
     client: true
   log_personal_messages_views: false
+  ignore_user_enabled:
+    hidden: true
+    default: false
 
 groups:
   enable_group_directory:
diff --git a/db/migrate/20190225133654_add_ignored_users_table.rb b/db/migrate/20190225133654_add_ignored_users_table.rb
new file mode 100644
index 00000000000..9ae56155660
--- /dev/null
+++ b/db/migrate/20190225133654_add_ignored_users_table.rb
@@ -0,0 +1,12 @@
+class AddIgnoredUsersTable < ActiveRecord::Migration[5.2]
+  def change
+    create_table :ignored_users do |t|
+      t.integer :user_id, null: false
+      t.integer :ignored_user_id, null: false
+      t.timestamps null: false
+    end
+
+    add_index :ignored_users, [:user_id, :ignored_user_id], unique: true
+    add_index :ignored_users, [:ignored_user_id, :user_id], unique: true
+  end
+end
diff --git a/lib/topic_view.rb b/lib/topic_view.rb
index f9b29c44440..a45e36f6ab1 100644
--- a/lib/topic_view.rb
+++ b/lib/topic_view.rb
@@ -330,13 +330,13 @@ class TopicView
         return {} if post_ids.blank?
 
         sql = <<~SQL
-          SELECT user_id, count(*) AS count_all
-            FROM posts
-           WHERE id in (:post_ids)
-             AND user_id IS NOT NULL
-        GROUP BY user_id
-        ORDER BY count_all DESC
-           LIMIT #{MAX_PARTICIPANTS}
+            SELECT user_id, count(*) AS count_all
+              FROM posts
+             WHERE id in (:post_ids)
+               AND user_id IS NOT NULL
+          GROUP BY user_id
+          ORDER BY count_all DESC
+             LIMIT #{MAX_PARTICIPANTS}
         SQL
 
         Hash[*DB.query_single(sql, post_ids: post_ids)]
@@ -515,22 +515,22 @@ class TopicView
 
   def get_sort_order(post_number)
     sql = <<~SQL
-    SELECT posts.sort_order
-    FROM posts
-    WHERE posts.post_number = #{post_number.to_i}
-    AND posts.topic_id = #{@topic.id.to_i}
-    LIMIT 1
+      SELECT posts.sort_order
+      FROM posts
+      WHERE posts.post_number = #{post_number.to_i}
+      AND posts.topic_id = #{@topic.id.to_i}
+      LIMIT 1
     SQL
 
     sort_order = DB.query_single(sql).first
 
     if !sort_order
       sql = <<~SQL
-      SELECT posts.sort_order
-      FROM posts
-      WHERE posts.topic_id = #{@topic.id.to_i}
-      ORDER BY @(post_number - #{post_number.to_i})
-      LIMIT 1
+        SELECT posts.sort_order
+        FROM posts
+        WHERE posts.topic_id = #{@topic.id.to_i}
+        ORDER BY @(post_number - #{post_number.to_i})
+        LIMIT 1
       SQL
 
       sort_order = DB.query_single(sql).first
@@ -602,6 +602,12 @@ class TopicView
     @contains_gaps = false
     @filtered_posts = unfiltered_posts
 
+    if SiteSetting.ignore_user_enabled
+      @filtered_posts = @filtered_posts.where.not("user_id IN (?) AND id <> ?",
+                                                  IgnoredUser.where(user_id: @user.id).select(:ignored_user_id),
+                                                  first_post_id)
+    end
+
     # Filters
     if @filter == 'summary'
       @filtered_posts = @filtered_posts.summary(@topic.id)
diff --git a/spec/fabricators/ignored_user.rb b/spec/fabricators/ignored_user.rb
new file mode 100644
index 00000000000..73175c8cd34
--- /dev/null
+++ b/spec/fabricators/ignored_user.rb
@@ -0,0 +1,3 @@
+Fabricator(:ignored_user) do
+  user
+end
diff --git a/spec/requests/users_controller_spec.rb b/spec/requests/users_controller_spec.rb
index 6465bc3bb97..81409de3fbe 100644
--- a/spec/requests/users_controller_spec.rb
+++ b/spec/requests/users_controller_spec.rb
@@ -2020,6 +2020,76 @@ describe UsersController do
     end
   end
 
+  describe '#ignore' do
+    it 'raises an error when not logged in' do
+      put "/u/#{user.username}/ignore.json", params: { ignored_user_id: "" }
+      expect(response.status).to eq(403)
+    end
+
+    context 'while logged in' do
+      let(:user) { Fabricate(:user) }
+      let(:another_user) { Fabricate(:user) }
+      before do
+        sign_in(user)
+      end
+
+      describe 'when SiteSetting.ignore_user_enabled is false' do
+        it 'raises an error' do
+          SiteSetting.ignore_user_enabled = false
+          put "/u/#{user.username}/ignore.json"
+          expect(response.status).to eq(404)
+        end
+      end
+
+      describe 'when SiteSetting.ignore_user_enabled is true' do
+        it 'creates IgnoredUser record' do
+          SiteSetting.ignore_user_enabled = true
+          put "/u/#{user.username}/ignore.json", params: { ignored_user_id: another_user.id }
+          expect(response.status).to eq(200)
+          expect(IgnoredUser.find_by(user_id: user.id,
+                                     ignored_user_id: another_user.id)).to be_present
+        end
+      end
+    end
+  end
+
+  describe '#watch' do
+    it 'raises an error when not logged in' do
+      delete "/u/#{user.username}/ignore.json"
+      expect(response.status).to eq(403)
+    end
+
+    context 'while logged in' do
+      let(:user) { Fabricate(:user) }
+      let(:another_user) { Fabricate(:user) }
+      before do
+        sign_in(user)
+      end
+
+      describe 'when SiteSetting.ignore_user_enabled is false' do
+        it 'raises an error' do
+          SiteSetting.ignore_user_enabled = false
+          delete "/u/#{user.username}/ignore.json", params: { ignored_user_id: another_user.id }
+          expect(response.status).to eq(404)
+        end
+      end
+
+      describe 'when SiteSetting.ignore_user_enabled is true' do
+        before do
+          Fabricate(:ignored_user, user_id: user.id, ignored_user_id: another_user.id)
+        end
+
+        it 'destroys IgnoredUser record' do
+          SiteSetting.ignore_user_enabled = true
+          delete "/u/#{user.username}/ignore.json", params: { ignored_user_id: another_user.id }
+          expect(response.status).to eq(200)
+          expect(IgnoredUser.find_by(user_id: user.id,
+                                     ignored_user_id: another_user.id)).to be_blank
+        end
+      end
+    end
+  end
+
   describe "for user with period in username" do
     let(:user_with_period) { Fabricate(:user, username: "myname.test") }
 
diff --git a/spec/serializers/web_hook_user_serializer_spec.rb b/spec/serializers/web_hook_user_serializer_spec.rb
index 6b6d3b1a623..65b5c8d876d 100644
--- a/spec/serializers/web_hook_user_serializer_spec.rb
+++ b/spec/serializers/web_hook_user_serializer_spec.rb
@@ -21,7 +21,7 @@ RSpec.describe WebHookUserSerializer do
 
   it 'should only include the required keys' do
     count = serializer.as_json.keys.count
-    difference = count - 43
+    difference = count - 45
 
     expect(difference).to eq(0), lambda {
       message = ""