diff --git a/app/controllers/api/v1/statuses_controller.rb b/app/controllers/api/v1/statuses_controller.rb
index 00819041d..b698dfda9 100644
--- a/app/controllers/api/v1/statuses_controller.rb
+++ b/app/controllers/api/v1/statuses_controller.rb
@@ -84,7 +84,16 @@ class Api::V1::StatusesController < Api::BaseController
   end
 
   def set_circle
-    @circle = status_params[:circle_id].blank? ? nil : current_account.owned_circles.find(status_params[:circle_id])
+    @circle = begin
+      if status_params[:visibility] == 'mutual'
+        status_params[:visibility] = 'limited'
+        current_account
+      elsif status_params[:circle_id].blank?
+        nil
+      else
+        current_account.owned_circles.find(status_params[:circle_id])
+      end
+    end
   rescue ActiveRecord::RecordNotFound
     render json: { error: I18n.t('statuses.errors.circle_not_found') }, status: 404
   end
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 71aac1f60..8e30d12a8 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -178,7 +178,7 @@ module ApplicationHelper
       text: [params[:title], params[:text], params[:url]].compact.join(' '),
     }
 
-    permit_visibilities = %w(public unlisted private direct)
+    permit_visibilities = %w(public unlisted private mutual direct)
     default_privacy     = current_account&.user&.setting_default_privacy
     permit_visibilities.shift(permit_visibilities.index(default_privacy) + 1) if default_privacy.present?
     state_params[:visibility] = params[:visibility] if permit_visibilities.include? params[:visibility]
diff --git a/app/javascript/mastodon/components/status.js b/app/javascript/mastodon/components/status.js
index d1c2073ac..5c548f015 100644
--- a/app/javascript/mastodon/components/status.js
+++ b/app/javascript/mastodon/components/status.js
@@ -82,6 +82,7 @@ const messages = defineMessages({
   public_short: { id: 'privacy.public.short', defaultMessage: 'Public' },
   unlisted_short: { id: 'privacy.unlisted.short', defaultMessage: 'Unlisted' },
   private_short: { id: 'privacy.private.short', defaultMessage: 'Followers-only' },
+  mutual_short: { id: 'privacy.mutual.short', defaultMessage: 'Mutual-followers-only' },
   limited_short: { id: 'privacy.limited.short', defaultMessage: 'Circle' },
   direct_short: { id: 'privacy.direct.short', defaultMessage: 'Direct' },
 });
@@ -540,6 +541,7 @@ class Status extends ImmutablePureComponent {
       'public': { icon: 'globe', text: intl.formatMessage(messages.public_short) },
       'unlisted': { icon: 'unlock', text: intl.formatMessage(messages.unlisted_short) },
       'private': { icon: 'lock', text: intl.formatMessage(messages.private_short) },
+      'mutual': { icon: 'exchange', text: intl.formatMessage(messages.mutual_short) },
       'limited': { icon: 'user-circle', text: intl.formatMessage(messages.limited_short) },
       'direct': { icon: 'envelope', text: intl.formatMessage(messages.direct_short) },
     };
diff --git a/app/javascript/mastodon/features/compose/components/privacy_dropdown.js b/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
index f9249f39d..99fdb363b 100644
--- a/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
+++ b/app/javascript/mastodon/features/compose/components/privacy_dropdown.js
@@ -16,6 +16,8 @@ const messages = defineMessages({
   unlisted_long: { id: 'privacy.unlisted.long', defaultMessage: 'Visible for all, but not in public timelines' },
   private_short: { id: 'privacy.private.short', defaultMessage: 'Followers-only' },
   private_long: { id: 'privacy.private.long', defaultMessage: 'Visible for followers only' },
+  mutual_short: { id: 'privacy.mutual.short', defaultMessage: 'Mutuals-followers-only' },
+  mutual_long: { id: 'privacy.mutual.long', defaultMessage: 'Visible for mutual followers only (Supported servers only)' },
   direct_short: { id: 'privacy.direct.short', defaultMessage: 'Direct' },
   direct_long: { id: 'privacy.direct.long', defaultMessage: 'Visible for mentioned users only' },
   limited_short: { id: 'privacy.limited.short', defaultMessage: 'Circle' },
@@ -239,6 +241,7 @@ class PrivacyDropdown extends React.PureComponent {
       { icon: 'globe', value: 'public', text: formatMessage(messages.public_short), meta: formatMessage(messages.public_long) },
       { icon: 'unlock', value: 'unlisted', text: formatMessage(messages.unlisted_short), meta: formatMessage(messages.unlisted_long) },
       { icon: 'lock', value: 'private', text: formatMessage(messages.private_short), meta: formatMessage(messages.private_long) },
+      { icon: 'exchange', value: 'mutual', text: formatMessage(messages.mutual_short), meta: formatMessage(messages.mutual_long) },
       { icon: 'user-circle', value: 'limited', text: formatMessage(messages.limited_short), meta: formatMessage(messages.limited_long) },
     ];
 
diff --git a/app/javascript/mastodon/features/status/components/detailed_status.js b/app/javascript/mastodon/features/status/components/detailed_status.js
index 9eb507db6..c0e8d8150 100644
--- a/app/javascript/mastodon/features/status/components/detailed_status.js
+++ b/app/javascript/mastodon/features/status/components/detailed_status.js
@@ -22,6 +22,7 @@ const messages = defineMessages({
   public_short: { id: 'privacy.public.short', defaultMessage: 'Public' },
   unlisted_short: { id: 'privacy.unlisted.short', defaultMessage: 'Unlisted' },
   private_short: { id: 'privacy.private.short', defaultMessage: 'Followers-only' },
+  mutual_short: { id: 'privacy.mutual.short', defaultMessage: 'Mutual-followers-only' },
   limited_short: { id: 'privacy.limited.short', defaultMessage: 'Circle' },
   direct_short: { id: 'privacy.direct.short', defaultMessage: 'Direct' },
 });
@@ -338,6 +339,7 @@ class DetailedStatus extends ImmutablePureComponent {
       'public': { icon: 'globe', text: intl.formatMessage(messages.public_short) },
       'unlisted': { icon: 'unlock', text: intl.formatMessage(messages.unlisted_short) },
       'private': { icon: 'lock', text: intl.formatMessage(messages.private_short) },
+      'mutual': { icon: 'exchange', text: intl.formatMessage(messages.mutual_short) },
       'limited': { icon: 'user-circle', text: intl.formatMessage(messages.limited_short) },
       'direct': { icon: 'envelope', text: intl.formatMessage(messages.direct_short) },
     };
diff --git a/app/javascript/mastodon/features/ui/components/boost_modal.js b/app/javascript/mastodon/features/ui/components/boost_modal.js
index 4060844f5..b25fe6560 100644
--- a/app/javascript/mastodon/features/ui/components/boost_modal.js
+++ b/app/javascript/mastodon/features/ui/components/boost_modal.js
@@ -21,6 +21,7 @@ const messages = defineMessages({
   public_short: { id: 'privacy.public.short', defaultMessage: 'Public' },
   unlisted_short: { id: 'privacy.unlisted.short', defaultMessage: 'Unlisted' },
   private_short: { id: 'privacy.private.short', defaultMessage: 'Followers-only' },
+  mutual_short: { id: 'privacy.mutual.short', defaultMessage: 'Mutual-followers-only' },
   limited_short: { id: 'privacy.limited.short', defaultMessage: 'Circle' },
   direct_short: { id: 'privacy.direct.short', defaultMessage: 'Direct' },
 });
@@ -94,6 +95,7 @@ class BoostModal extends ImmutablePureComponent {
       'public': { icon: 'globe', text: intl.formatMessage(messages.public_short) },
       'unlisted': { icon: 'unlock', text: intl.formatMessage(messages.unlisted_short) },
       'private': { icon: 'lock', text: intl.formatMessage(messages.private_short) },
+      'mutual': { icon: 'exchange', text: intl.formatMessage(messages.mutual_short) },
       'limited': { icon: 'user-circle', text: intl.formatMessage(messages.limited_short) },
       'direct': { icon: 'envelope', text: intl.formatMessage(messages.direct_short) },
     };
diff --git a/app/javascript/mastodon/locales/en.json b/app/javascript/mastodon/locales/en.json
index f1e558a20..8daf8d507 100644
--- a/app/javascript/mastodon/locales/en.json
+++ b/app/javascript/mastodon/locales/en.json
@@ -388,6 +388,8 @@
   "privacy.direct.short": "Direct",
   "privacy.limited.long": "Visible for circle users only",
   "privacy.limited.short": "Circle",
+  "privacy.mutual.long": "Visible for mutual followers only (Supported servers only)",
+  "privacy.mutual.short": "Mutual-followers-only",
   "privacy.private.long": "Visible for followers only",
   "privacy.private.short": "Followers-only",
   "privacy.public.long": "Visible for all, shown in public timelines",
diff --git a/app/javascript/mastodon/locales/ja.json b/app/javascript/mastodon/locales/ja.json
index 9bafc79e7..1f2586866 100644
--- a/app/javascript/mastodon/locales/ja.json
+++ b/app/javascript/mastodon/locales/ja.json
@@ -388,6 +388,8 @@
   "privacy.direct.short": "ダイレクト",
   "privacy.limited.long": "サークルで指定したユーザーのみ閲覧可",
   "privacy.limited.short": "サークル",
+  "privacy.mutual.long": "相互フォローのみ閲覧可（対応サーバのみ）",
+  "privacy.mutual.short": "相互フォロー限定",
   "privacy.private.long": "フォロワーのみ閲覧可",
   "privacy.private.short": "フォロワー限定",
   "privacy.public.long": "誰でも閲覧可、公開TLに表示",
diff --git a/app/javascript/mastodon/reducers/compose.js b/app/javascript/mastodon/reducers/compose.js
index 4c6dbc5cb..c8ba41189 100644
--- a/app/javascript/mastodon/reducers/compose.js
+++ b/app/javascript/mastodon/reducers/compose.js
@@ -219,7 +219,7 @@ const insertEmoji = (state, position, emojiData, needsSpace) => {
 };
 
 const privacyPreference = (a, b) => {
-  const order = ['public', 'unlisted', 'private', 'limited', 'direct'];
+  const order = ['public', 'unlisted', 'private', 'mutual', 'limited', 'direct'];
   return order[Math.max(order.indexOf(a), order.indexOf(b), 0)];
 };
 
diff --git a/app/models/concerns/account_interactions.rb b/app/models/concerns/account_interactions.rb
index cf5ab11d2..d8139fc9a 100644
--- a/app/models/concerns/account_interactions.rb
+++ b/app/models/concerns/account_interactions.rb
@@ -341,6 +341,10 @@ module AccountInteractions
     end
   end
 
+  def mutuals
+    followers.merge(Account.where(id: following))
+  end
+
   private
 
   def remove_potential_friendship(other_account, mutual = false)
diff --git a/app/models/status.rb b/app/models/status.rb
index 8bf3e64fa..842b86bf5 100644
--- a/app/models/status.rb
+++ b/app/models/status.rb
@@ -51,7 +51,7 @@ class Status < ApplicationRecord
 
   update_index('statuses#status', :proper)
 
-  enum visibility: [:public, :unlisted, :private, :mutual, :direct, :limited], _suffix: :visibility
+  enum visibility: [:public, :unlisted, :private, :direct, :limited, :mutual], _suffix: :visibility
   enum expires_action: [:delete, :hint], _prefix: :expires
 
   belongs_to :application, class_name: 'Doorkeeper::Application', optional: true
diff --git a/app/services/process_mentions_service.rb b/app/services/process_mentions_service.rb
index 50351a0e1..5b6279637 100644
--- a/app/services/process_mentions_service.rb
+++ b/app/services/process_mentions_service.rb
@@ -44,7 +44,7 @@ class ProcessMentionsService < BaseService
     end
 
     if circle.present?
-      circle.accounts.find_each do |target_account|
+      (circle.class.name == 'Account' ? circle.mutuals : circle.accounts).find_each do |target_account|
         status.mentions.create(silent: true, account: target_account)
       end
     elsif status.limited_visibility? && status.thread&.limited_visibility?
diff --git a/config/locales/en.yml b/config/locales/en.yml
index aaf2f3448..3a2d4bcbd 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -1388,6 +1388,8 @@ en:
       direct_long: Only show to mentioned users
       limited: Circle
       limited_long: Only show to circle users
+      mutual: Mutual
+      mutual_long: Only show to mutual followers
       private: Followers-only
       private_long: Only show to followers
       public: Public
diff --git a/config/locales/ja.yml b/config/locales/ja.yml
index dde462557..95029ec4d 100644
--- a/config/locales/ja.yml
+++ b/config/locales/ja.yml
@@ -1325,6 +1325,8 @@ ja:
       direct_long: 送信した相手のみ閲覧可
       limited: サークル
       limited_long: サークルで指定したユーザーのみ閲覧可
+      mutual: 相互フォロー限定
+      mutual_long: 相互フォロー相手にのみ表示されます
       private: フォロワー限定
       private_long: フォロワーにのみ表示されます
       public: 公開