diff --git a/app/assets/javascripts/filtered_search/filtered_search_dropdown_manager.js b/app/assets/javascripts/filtered_search/filtered_search_dropdown_manager.js
index 1ae4bbf538a1514b677c0d5bdb0458d205fcfb97..2c8182ae3967585747825bb5e4c30a571c03601f 100644
--- a/app/assets/javascripts/filtered_search/filtered_search_dropdown_manager.js
+++ b/app/assets/javascripts/filtered_search/filtered_search_dropdown_manager.js
@@ -67,6 +67,11 @@ export default class FilteredSearchDropdownManager {
         gl: DropdownUser,
         element: this.container.querySelector('#js-dropdown-assignee'),
       },
+      approver: {
+        reference: null,
+        gl: DropdownUser,
+        element: this.container.querySelector('#js-dropdown-approver'),
+      },
       milestone: {
         reference: null,
         gl: DropdownNonUser,
diff --git a/app/assets/javascripts/filtered_search/filtered_search_token_keys.js b/app/assets/javascripts/filtered_search/filtered_search_token_keys.js
index 087ef5cd6f2236ec431d667980f61045a298174b..1b76a81ee3a525807d62d6b86a61b8b99c2483ef 100644
--- a/app/assets/javascripts/filtered_search/filtered_search_token_keys.js
+++ b/app/assets/javascripts/filtered_search/filtered_search_token_keys.js
@@ -12,6 +12,13 @@ const tokenKeys = [{
   symbol: '@',
   icon: 'user',
   tag: '@assignee',
+}, {
+  key: 'approver',
+  type: 'string',
+  param: 'username',
+  symbol: '@',
+  icon: 'check',
+  tag: '@approver',
 }, {
   key: 'milestone',
   type: 'string',
@@ -53,6 +60,10 @@ const conditions = [{
   url: 'assignee_id=0',
   tokenKey: 'assignee',
   value: 'none',
+}, {
+  url: 'approver_id=0',
+  tokenKey: 'approver',
+  value: 'none',
 }, {
   url: 'milestone_title=No+Milestone',
   tokenKey: 'milestone',
diff --git a/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js b/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js
index 56fe1ab4e9038e27216910eeb8cd7a3161f375a7..b0843c341f5083eea9806d3b0bbecc5be840dedb 100644
--- a/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js
+++ b/app/assets/javascripts/filtered_search/filtered_search_visual_tokens.js
@@ -171,7 +171,7 @@ export default class FilteredSearchVisualTokens {
     const tokenType = tokenName.toLowerCase();
     if (tokenType === 'label') {
       FilteredSearchVisualTokens.updateLabelTokenColor(tokenValueContainer, tokenValue);
-    } else if ((tokenType === 'author') || (tokenType === 'assignee')) {
+    } else if ((tokenType === 'author') || (tokenType === 'assignee') || (tokenType === 'approver')) {
       FilteredSearchVisualTokens.updateUserTokenAppearance(
         tokenValueContainer, tokenValueElement, tokenValue,
       );
diff --git a/app/controllers/dashboard_controller.rb b/app/controllers/dashboard_controller.rb
index 6541434a3f0880ec1a755350f54c8f5c81f05ff7..5f92f06fc51ab513e511ee6edeb6031305be8fe1 100644
--- a/app/controllers/dashboard_controller.rb
+++ b/app/controllers/dashboard_controller.rb
@@ -5,6 +5,7 @@ class DashboardController < Dashboard::ApplicationController
   FILTER_PARAMS = [
     :author_id,
     :assignee_id,
+    :approver_id,
     :milestone_title,
     :weight,
     :label_name
diff --git a/app/finders/issuable_finder.rb b/app/finders/issuable_finder.rb
index 372e2a96c2c9457f038cd58980a987a3c6551961..5570f20291ca7b7309403aff931f68abd0840597 100644
--- a/app/finders/issuable_finder.rb
+++ b/app/finders/issuable_finder.rb
@@ -40,6 +40,8 @@ def self.scalar_params
     @scalar_params ||= %i[
       assignee_id
       assignee_username
+      approver_id
+      approver_username
       author_id
       author_username
       authorized_only
diff --git a/app/finders/merge_requests_finder.rb b/app/finders/merge_requests_finder.rb
index 40089c082c1240025fea253d724ccb0546d87359..e2c7f760ee52bb40a6f180d757015cd6f8abfdfb 100644
--- a/app/finders/merge_requests_finder.rb
+++ b/app/finders/merge_requests_finder.rb
@@ -12,6 +12,7 @@
 #     milestone_title: string
 #     author_id: integer
 #     assignee_id: integer
+#     approver_id: integer
 #     search: string
 #     label_name: string
 #     sort: string
@@ -31,12 +32,55 @@ def klass
 
   def filter_items(_items)
     items = by_source_branch(super)
+    items = by_approver(items)
 
     by_target_branch(items)
   end
 
   private
 
+  def by_approver(items)
+    if approvers.any?
+      approvers.each do |approver|
+        items = items.can_approve(approver)
+      end
+
+      items
+    elsif no_approver?
+      items.without_approvers
+    elsif approver_id? || approver_username? # approver not found
+      items.none
+    else
+      items
+    end
+  end
+
+  def approvers
+    return @approvers if defined?(@approvers)
+
+    @approvers =
+      if params[:approver_ids]
+        User.where(id: params[:approver_ids])
+      elsif params[:approver_username]
+        User.where(username: params[:approver_username])
+      else
+        []
+      end
+  end
+
+  def approver_id?
+    params[:approver_id].present? && params[:approver_id] != NONE
+  end
+
+  def approver_username?
+    params[:approver_username].present? && params[:approver_username] != NONE
+  end
+
+  def no_approver?
+    # Approver_id takes precedence over approver_username
+    params[:approver_id] == NONE || params[:approver_username] == NONE
+  end
+
   def source_branch
     @source_branch ||= params[:source_branch].presence
   end
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index cd11e134b9b5473afcadfcbfd4167bbae9852960..0401d571965f270c26f8c400f8f2eb5ed6b3f28c 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -171,6 +171,9 @@ def check_state?(merge_status)
   scope :unassigned, -> { where("assignee_id IS NULL") }
   scope :assigned_to, ->(u) { where(assignee_id: u.id)}
 
+  scope :without_approvers, -> { includes(:approvers).where({ approvers: { user_id: nil } }) }
+  scope :can_approve, ->(u) { includes(:approvers).where({ approvers: { user_id: u.id } }) }
+
   participant :assignee
 
   after_save :keep_around_commit
diff --git a/app/views/shared/issuable/_filter.html.haml b/app/views/shared/issuable/_filter.html.haml
index 1cd8ce0826c8f698c8e448b19d48b0bfebd885b6..1ecd71a4d1ec5c74b4b1596a00383ba0b5a1b60e 100644
--- a/app/views/shared/issuable/_filter.html.haml
+++ b/app/views/shared/issuable/_filter.html.haml
@@ -2,7 +2,7 @@
 
 .issues-filters
   .issues-details-filters.row-content-block.second-block
-    = form_tag page_filter_path(without: [:assignee_id, :author_id, :milestone_title, :label_name, :search]), method: :get, class: 'filter-form js-filter-form' do
+    = form_tag page_filter_path(without: [:assignee_id, :approver_id, :author_id, :milestone_title, :label_name, :search]), method: :get, class: 'filter-form js-filter-form' do
       - if params[:search].present?
         = hidden_field_tag :search, params[:search]
       .issues-other-filters
@@ -18,6 +18,13 @@
           = dropdown_tag(user_dropdown_label(params[:assignee_id], "Assignee"), options: { toggle_class: "js-user-search js-filter-submit js-assignee-search", title: "Filter by assignee", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable dropdown-menu-assignee js-filter-submit",
             placeholder: "Search assignee", data: { any_user: "Any Assignee", first_user: current_user&.username, null_user: true, current_user: true, project_id: @project&.id, group_id: @group&.id, selected: params[:assignee_id], field_name: "assignee_id", default_label: "Assignee" } })
 
+        - if controller.controller_name == 'merge_requests' || controller.action_name == 'merge_requests'
+          .filter-item.inline
+            - if params[:approver_id].present?
+              = hidden_field_tag(:approver_id, params[:approver_id])
+            = dropdown_tag(user_dropdown_label(params[:approver_id], "Approver"), options: { toggle_class: "js-user-search js-filter-submit js-approvers-search", title: "Filter by approvers", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable dropdown-menu-approver js-filter-submit",
+              placeholder: "Search approver", data: { any_user: "Any Approver", first_user: current_user&.username, null_user: true, current_user: true, project_id: @project&.id, group_id: @group&.id, selected: params[:approver_id], field_name: "approver_id", default_label: "Approver" } })
+
         .filter-item.inline.milestone-filter
           = render "shared/issuable/milestone_dropdown", selected: finder.milestones.try(:first), name: :milestone_title, show_any: true, show_upcoming: true, show_started: true
 
diff --git a/app/views/shared/issuable/_search_bar.html.haml b/app/views/shared/issuable/_search_bar.html.haml
index 9ce7f6fe2699efed1a2b1a99471b809fa28ec846..145d5c9617d070f7cc6b4b66a447d382fe4d8585 100644
--- a/app/views/shared/issuable/_search_bar.html.haml
+++ b/app/views/shared/issuable/_search_bar.html.haml
@@ -69,6 +69,19 @@
                 = render 'shared/issuable/user_dropdown_item',
                   user: User.new(username: '{{username}}', name: '{{name}}'),
                   avatar: { lazy: true, url: '{{avatar_url}}' }
+            #js-dropdown-approver.filtered-search-input-dropdown-menu.dropdown-menu
+              %ul{ data: { dropdown: true } }
+                %li.filter-dropdown-item{ data: { value: 'none' } }
+                  %button.btn.btn-link
+                    No Approver
+                %li.divider.droplab-item-ignore
+                - if current_user
+                  = render 'shared/issuable/user_dropdown_item',
+                    user: current_user
+              %ul.filter-dropdown{ data: { dynamic: true, dropdown: true } }
+                = render 'shared/issuable/user_dropdown_item',
+                  user: User.new(username: '{{username}}', name: '{{name}}'),
+                  avatar: { lazy: true, url: '{{avatar_url}}' }
             #js-dropdown-milestone.filtered-search-input-dropdown-menu.dropdown-menu
               %ul{ data: { dropdown: true } }
                 %li.filter-dropdown-item{ data: { value: 'none' } }
diff --git a/ee/changelogs/unreleased/1951-filter-merge-requests-by-approver.yml b/ee/changelogs/unreleased/1951-filter-merge-requests-by-approver.yml
new file mode 100644
index 0000000000000000000000000000000000000000..8d977c847880140fcc8380f3476308477f58b67e
--- /dev/null
+++ b/ee/changelogs/unreleased/1951-filter-merge-requests-by-approver.yml
@@ -0,0 +1,5 @@
+---
+title: Add filter for merge requests by individual approver
+merge_request: 6696
+author: Glavin Wiechert
+type: added
diff --git a/spec/features/issues/filtered_search/dropdown_hint_spec.rb b/spec/features/issues/filtered_search/dropdown_hint_spec.rb
index b99c5a7f4e33490453c1f4803a1c9e41e71470e4..9d61290200e699ab4c2f34c147d978c2074e67c3 100644
--- a/spec/features/issues/filtered_search/dropdown_hint_spec.rb
+++ b/spec/features/issues/filtered_search/dropdown_hint_spec.rb
@@ -65,7 +65,7 @@ def click_hint(text)
       it 'filters with text' do
         filtered_search.set('a')
 
-        expect(find(js_dropdown_hint)).to have_selector('.filter-dropdown .filter-dropdown-item', count: 4)
+        expect(find(js_dropdown_hint)).to have_selector('.filter-dropdown .filter-dropdown-item', count: 5)
       end
     end
 
diff --git a/spec/features/issues/filtered_search/search_bar_spec.rb b/spec/features/issues/filtered_search/search_bar_spec.rb
index c44689228832761f88c11dffc66ce5c28b7a517a..3489f0ec9b683a1ce4545dea0e24348bd47e863c 100644
--- a/spec/features/issues/filtered_search/search_bar_spec.rb
+++ b/spec/features/issues/filtered_search/search_bar_spec.rb
@@ -100,7 +100,7 @@ def get_left_style(style)
       find('.filtered-search-box .clear-search').click
       filtered_search.click
 
-      expect(find('#js-dropdown-hint')).to have_selector('.filter-dropdown .filter-dropdown-item', count: 6)
+      expect(find('#js-dropdown-hint')).to have_selector('.filter-dropdown .filter-dropdown-item', count: 7)
       expect(get_left_style(find('#js-dropdown-hint')['style'])).to eq(hint_offset)
     end
   end