diff --git a/CHANGELOG b/CHANGELOG
index 94bccb729dd..89c880467cd 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -116,6 +116,7 @@ v 8.12.0 (unreleased)
   - Use default clone protocol on "check out, review, and merge locally" help page URL
   - API for Ci Lint !5953 (Katarzyna Kobierska Urszula Budziszewska)
   - Allow bulk update merge requests from merge requests index page
+  - Add notification_settings API calls !5632 (mahcsig)
 
 v 8.11.6 (unreleased)
 
diff --git a/doc/api/README.md b/doc/api/README.md
index e12070dc1ce..7661e1eea02 100644
--- a/doc/api/README.md
+++ b/doc/api/README.md
@@ -27,6 +27,7 @@ following locations:
 - [Open source license templates](licenses.md)
 - [Namespaces](namespaces.md)
 - [Notes](notes.md) (comments)
+- [Notification settings](notification_settings.md)
 - [Pipelines](pipelines.md)
 - [Projects](projects.md) including setting Webhooks
 - [Project Access Requests](access_requests.md)
diff --git a/doc/api/notification_settings.md b/doc/api/notification_settings.md
new file mode 100644
index 00000000000..ff6c9e4931c
--- /dev/null
+++ b/doc/api/notification_settings.md
@@ -0,0 +1,169 @@
+# Notification settings
+
+>**Note:** This feature was [introduced][ce-5632] in GitLab 8.12.
+
+**Valid notification levels**
+
+The notification levels are defined in the `NotificationSetting::level` model enumeration. Currently, these levels are recognized:
+
+```
+disabled
+participating
+watch
+global
+mention
+custom
+```
+
+If the `custom` level is used, specific email events can be controlled. Notification email events are defined in the `NotificationSetting::EMAIL_EVENTS` model variable. Currently, these events are recognized:
+
+```
+new_note
+new_issue
+reopen_issue
+close_issue
+reassign_issue
+new_merge_request
+reopen_merge_request
+close_merge_request
+reassign_merge_request
+merge_merge_request
+```
+
+## Global notification settings
+
+Get current notification settings and email address.
+
+```
+GET /notification_settings
+```
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/notification_settings
+```
+
+Example response:
+
+```json
+{
+  "level": "participating",
+  "notification_email": "admin@example.com"
+}
+```
+
+## Update global notification settings
+
+Update current notification settings and email address.
+
+```
+PUT /notification_settings
+```
+
+```bash
+curl --request PUT --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/notification_settings?level=watch
+```
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `level` | string | no | The global notification level |
+| `notification_email` | string | no | The email address to send notifications |
+| `new_note` | boolean | no | Enable/disable this notification |
+| `new_issue` | boolean | no | Enable/disable this notification |
+| `reopen_issue` | boolean | no | Enable/disable this notification |
+| `close_issue` | boolean | no | Enable/disable this notification |
+| `reassign_issue` | boolean | no | Enable/disable this notification |
+| `new_merge_request` | boolean | no | Enable/disable this notification |
+| `reopen_merge_request` | boolean | no | Enable/disable this notification |
+| `close_merge_request` | boolean | no | Enable/disable this notification |
+| `reassign_merge_request` | boolean | no | Enable/disable this notification |
+| `merge_merge_request` | boolean | no | Enable/disable this notification |
+
+Example response:
+
+```json
+{
+  "level": "watch",
+  "notification_email": "admin@example.com"
+}
+```
+
+## Group / project level notification settings
+
+Get current group or project notification settings.
+
+```
+GET /groups/:id/notification_settings
+GET /projects/:id/notification_settings
+```
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/groups/5/notification_settings
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/projects/8/notification_settings
+```
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `id` | integer/string | yes | The group/project ID or path |
+
+Example response:
+
+```json
+{
+  "level": "global"
+}
+```
+
+## Update group/project level notification settings
+
+Update current group/project notification settings.
+
+```
+PUT /groups/:id/notification_settings
+PUT /projects/:id/notification_settings
+```
+
+```bash
+curl --request PUT --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/groups/5/notification_settings?level=watch
+curl --request PUT --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v3/projects/8/notification_settings?level=custom&new_note=true
+```
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `id` | integer/string | yes | The group/project ID or path |
+| `level` | string | no | The global notification level |
+| `new_note` | boolean | no | Enable/disable this notification |
+| `new_issue` | boolean | no | Enable/disable this notification |
+| `reopen_issue` | boolean | no | Enable/disable this notification |
+| `close_issue` | boolean | no | Enable/disable this notification |
+| `reassign_issue` | boolean | no | Enable/disable this notification |
+| `new_merge_request` | boolean | no | Enable/disable this notification |
+| `reopen_merge_request` | boolean | no | Enable/disable this notification |
+| `close_merge_request` | boolean | no | Enable/disable this notification |
+| `reassign_merge_request` | boolean | no | Enable/disable this notification |
+| `merge_merge_request` | boolean | no | Enable/disable this notification |
+
+Example responses:
+
+```json
+{
+  "level": "watch"
+}
+
+{
+  "level": "custom",
+  "events": {
+    "new_note": true,
+    "new_issue": false,
+    "reopen_issue": false,
+    "close_issue": false,
+    "reassign_issue": false,
+    "new_merge_request": false,
+    "reopen_merge_request": false,
+    "close_merge_request": false,
+    "reassign_merge_request": false,
+    "merge_merge_request": false
+  }
+}
+```
+
+[ce-5632]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5632
diff --git a/lib/api/api.rb b/lib/api/api.rb
index a08fb056049..74ca4728695 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -51,6 +51,7 @@ module API
     mount ::API::Milestones
     mount ::API::Namespaces
     mount ::API::Notes
+    mount ::API::NotificationSettings
     mount ::API::Pipelines
     mount ::API::ProjectHooks
     mount ::API::ProjectSnippets
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 3faba79415b..4f736e4ec2b 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -375,7 +375,7 @@ module API
       expose :access_level
       expose :notification_level do |member, options|
         if member.notification_setting
-          NotificationSetting.levels[member.notification_setting.level]
+          ::NotificationSetting.levels[member.notification_setting.level]
         end
       end
     end
@@ -386,6 +386,21 @@ module API
     class GroupAccess < MemberAccess
     end
 
+    class NotificationSetting < Grape::Entity
+      expose :level
+      expose :events, if: ->(notification_setting, _) { notification_setting.custom? } do
+        ::NotificationSetting::EMAIL_EVENTS.each do |event|
+          expose event
+        end
+      end
+    end
+
+    class GlobalNotificationSetting < NotificationSetting
+      expose :notification_email do |notification_setting, options|
+        notification_setting.user.notification_email
+      end
+    end
+
     class ProjectService < Grape::Entity
       expose :id, :title, :created_at, :updated_at, :active
       expose :push_events, :issues_events, :merge_requests_events
diff --git a/lib/api/notification_settings.rb b/lib/api/notification_settings.rb
new file mode 100644
index 00000000000..a70a7e71073
--- /dev/null
+++ b/lib/api/notification_settings.rb
@@ -0,0 +1,97 @@
+module API
+  # notification_settings API
+  class NotificationSettings < Grape::API
+    before { authenticate! }
+
+    helpers ::API::Helpers::MembersHelpers
+
+    resource :notification_settings do
+      desc 'Get global notification level settings and email, defaults to Participate' do
+        detail 'This feature was introduced in GitLab 8.12'
+        success Entities::GlobalNotificationSetting
+      end
+      get do
+        notification_setting = current_user.global_notification_setting
+
+        present notification_setting, with: Entities::GlobalNotificationSetting
+      end
+
+      desc 'Update global notification level settings and email, defaults to Participate' do
+        detail 'This feature was introduced in GitLab 8.12'
+        success Entities::GlobalNotificationSetting
+      end
+      params do
+        optional :level, type: String, desc: 'The global notification level'
+        optional :notification_email, type: String, desc: 'The email address to send notifications'
+        NotificationSetting::EMAIL_EVENTS.each do |event|
+          optional event, type: Boolean, desc: 'Enable/disable this notification'
+        end
+      end
+      put do
+        notification_setting = current_user.global_notification_setting
+
+        begin
+          notification_setting.transaction do
+            new_notification_email = params.delete(:notification_email)
+            declared_params = declared(params, include_missing: false).to_h
+
+            current_user.update(notification_email: new_notification_email) if new_notification_email
+            notification_setting.update(declared_params)
+          end
+        rescue ArgumentError => e # catch level enum error
+          render_api_error! e.to_s, 400
+        end
+
+        render_validation_error! current_user
+        render_validation_error! notification_setting
+        present notification_setting, with: Entities::GlobalNotificationSetting
+      end
+    end
+
+    %w[group project].each do |source_type|
+      resource source_type.pluralize do
+        desc "Get #{source_type} level notification level settings, defaults to Global" do
+          detail 'This feature was introduced in GitLab 8.12'
+          success Entities::NotificationSetting
+        end
+        params do
+          requires :id, type: String, desc: 'The group ID or project ID or project NAMESPACE/PROJECT_NAME'
+        end
+        get ":id/notification_settings" do
+          source = find_source(source_type, params[:id])
+
+          notification_setting = current_user.notification_settings_for(source)
+
+          present notification_setting, with: Entities::NotificationSetting
+        end
+
+        desc "Update #{source_type} level notification level settings, defaults to Global" do
+          detail 'This feature was introduced in GitLab 8.12'
+          success Entities::NotificationSetting
+        end
+        params do
+          requires :id, type: String, desc: 'The group ID or project ID or project NAMESPACE/PROJECT_NAME'
+          optional :level, type: String, desc: "The #{source_type} notification level"
+          NotificationSetting::EMAIL_EVENTS.each do |event|
+            optional event, type: Boolean, desc: 'Enable/disable this notification'
+          end
+        end
+        put ":id/notification_settings" do
+          source = find_source(source_type, params.delete(:id))
+          notification_setting = current_user.notification_settings_for(source)
+
+          begin
+            declared_params = declared(params, include_missing: false).to_h
+
+            notification_setting.update(declared_params)
+          rescue ArgumentError => e # catch level enum error
+            render_api_error! e.to_s, 400
+          end
+
+          render_validation_error! notification_setting
+          present notification_setting, with: Entities::NotificationSetting
+        end
+      end
+    end
+  end
+end
diff --git a/spec/requests/api/notification_settings_spec.rb b/spec/requests/api/notification_settings_spec.rb
new file mode 100644
index 00000000000..e6d8a5ee954
--- /dev/null
+++ b/spec/requests/api/notification_settings_spec.rb
@@ -0,0 +1,89 @@
+require 'spec_helper'
+
+describe API::API, api: true do
+  include ApiHelpers
+
+  let(:user) { create(:user) }
+  let!(:group) { create(:group) }
+  let!(:project) { create(:project, :public, creator_id: user.id, namespace: group) }
+
+  describe "GET /notification_settings" do
+    it "returns global notification settings for the current user" do
+      get api("/notification_settings", user)
+
+      expect(response).to have_http_status(200)
+      expect(json_response).to be_a Hash
+      expect(json_response['notification_email']).to eq(user.notification_email)
+      expect(json_response['level']).to eq(user.global_notification_setting.level)
+    end
+  end
+
+  describe "PUT /notification_settings" do
+    let(:email) { create(:email, user: user) }
+
+    it "updates global notification settings for the current user" do
+      put api("/notification_settings", user), { level: 'watch', notification_email: email.email }
+
+      expect(response).to have_http_status(200)
+      expect(json_response['notification_email']).to eq(email.email)
+      expect(user.reload.notification_email).to eq(email.email)
+      expect(json_response['level']).to eq(user.reload.global_notification_setting.level)
+    end
+  end
+
+  describe "PUT /notification_settings" do
+    it "fails on non-user email address" do
+      put api("/notification_settings", user), { notification_email: 'invalid@example.com' }
+
+      expect(response).to have_http_status(400)
+    end
+  end
+
+  describe "GET /groups/:id/notification_settings" do
+    it "returns group level notification settings for the current user" do
+      get api("/groups/#{group.id}/notification_settings", user)
+
+      expect(response).to have_http_status(200)
+      expect(json_response).to be_a Hash
+      expect(json_response['level']).to eq(user.notification_settings_for(group).level)
+    end
+  end
+
+  describe "PUT /groups/:id/notification_settings" do
+    it "updates group level notification settings for the current user" do
+      put api("/groups/#{group.id}/notification_settings", user), { level: 'watch' }
+
+      expect(response).to have_http_status(200)
+      expect(json_response['level']).to eq(user.reload.notification_settings_for(group).level)
+    end
+  end
+
+  describe "GET /projects/:id/notification_settings" do
+    it "returns project level notification settings for the current user" do
+      get api("/projects/#{project.id}/notification_settings", user)
+
+      expect(response).to have_http_status(200)
+      expect(json_response).to be_a Hash
+      expect(json_response['level']).to eq(user.notification_settings_for(project).level)
+    end
+  end
+
+  describe "PUT /projects/:id/notification_settings" do
+    it "updates project level notification settings for the current user" do
+      put api("/projects/#{project.id}/notification_settings", user), { level: 'custom', new_note: true }
+
+      expect(response).to have_http_status(200)
+      expect(json_response['level']).to eq(user.reload.notification_settings_for(project).level)
+      expect(json_response['events']['new_note']).to eq(true)
+      expect(json_response['events']['new_issue']).to eq(false)
+    end
+  end
+
+  describe "PUT /projects/:id/notification_settings" do
+    it "fails on invalid level" do
+      put api("/projects/#{project.id}/notification_settings", user), { level: 'invalid' }
+
+      expect(response).to have_http_status(400)
+    end
+  end
+end