diff --git a/GITLAB_WORKHORSE_VERSION b/GITLAB_WORKHORSE_VERSION
index ba624dacf9ace2d1a5ceae2a065fd8e527403529..72963fb08c2187b1f7d9c6110e4dcc4749982402 100644
--- a/GITLAB_WORKHORSE_VERSION
+++ b/GITLAB_WORKHORSE_VERSION
@@ -1 +1 @@
-8.20.0
+8.21.0
diff --git a/changelogs/unreleased/georgekoltsov-group-import-api.yml b/changelogs/unreleased/georgekoltsov-group-import-api.yml
new file mode 100644
index 0000000000000000000000000000000000000000..b6c497afdaf3886e3d157bcf8607ea966c2932c1
--- /dev/null
+++ b/changelogs/unreleased/georgekoltsov-group-import-api.yml
@@ -0,0 +1,5 @@
+---
+title: Add Group Import API endpoint & update Group Import/Export documentation
+merge_request: 20353
+author:
+type: added
diff --git a/doc/api/group_import_export.md b/doc/api/group_import_export.md
new file mode 100644
index 0000000000000000000000000000000000000000..c97a753d298e5b9aff4c441e99446bd452579a27
--- /dev/null
+++ b/doc/api/group_import_export.md
@@ -0,0 +1,83 @@
+# Group Import/Export API
+
+> Introduced in GitLab 12.8 as an experimental feature. May change in future releases.
+
+Group Import/Export functionality allows to export group structure and import it at a new location.
+Used in combination with [Project Import/Export](project_import_export.md) it allows you to preserve connections with group level relations
+(e.g. a connection between a project issue and group epic).
+
+Group Export includes:
+
+1. Group Milestones
+1. Group Boards
+1. Group Labels
+1. Group Badges
+1. Group Members
+1. Sub-groups (each sub-group includes all data above)
+
+## Schedule new export
+
+Start a new group export.
+
+```text
+POST /groups/:id/export
+```
+
+| Attribute | Type           | Required | Description                              |
+| --------- | -------------- | -------- | ---------------------------------------- |
+| `id`      | integer/string | yes      | ID of the groupd owned by the authenticated user |
+
+```shell
+curl --request POST --header "PRIVATE-TOKEN: <your_access_token>" https://gitlab.example.com/api/v4/groups/1/export
+```
+
+```json
+{
+  "message": "202 Accepted"
+}
+```
+
+## Export download
+
+Download the finished export.
+
+```text
+GET /groups/:id/export/download
+```
+
+| Attribute | Type           | Required | Description                              |
+| --------- | -------------- | -------- | ---------------------------------------- |
+| `id`      | integer/string | yes      | ID of the group owned by the authenticated user |
+
+```shell
+curl --header "PRIVATE-TOKEN: <your_access_token>" --remote-header-name --remote-name https://gitlab.example.com/api/v4/groups/1/export/download
+```
+
+```shell
+ls *export.tar.gz
+2020-12-05_22-11-148_namespace_export.tar.gz
+```
+
+Time spent on exporting a group may vary depending on a size of the group. Export download endpoint will return exported archive once it is available. 404 is returned otherwise.
+
+## Import a file
+
+```text
+POST /groups/import
+```
+
+| Attribute | Type           | Required | Description                              |
+| --------- | -------------- | -------- | ---------------------------------------- |
+| `name` | string | yes | The name of the group to be imported |
+| `path` | string | yes | Name and path for new group |
+| `file` | string | yes | The file to be uploaded |
+| `parent_id` | integer | no | ID of a parent group that the group will be imported into. Defaults to the current user's namespace if not provided. |
+
+To upload a file from your file system, use the `--form` argument. This causes
+cURL to post data using the header `Content-Type: multipart/form-data`.
+The `file=` parameter must point to a file on your file system and be preceded
+by `@`. For example:
+
+```shell
+curl --request POST --header "PRIVATE-TOKEN: <your_access_token>" --form "name=imported-group" --form "path=imported-group" --form "file=@/path/to/file" https://gitlab.example.com/api/v4/groups/import
+```
diff --git a/doc/api/groups.md b/doc/api/groups.md
index 0a2446a8be92d7c201df3752f9776d06579fb29a..3d2ac8c1e1847e1f908250e8646928b06d1abe32 100644
--- a/doc/api/groups.md
+++ b/doc/api/groups.md
@@ -875,3 +875,7 @@ And to switch pages add:
 ## Group badges
 
 Read more in the [Group Badges](group_badges.md) documentation.
+
+## Group Import/Export
+
+Read more in the [Group Import/Export](group_import_export.md) documentation.
diff --git a/lib/api/api.rb b/lib/api/api.rb
index e75fd7e88a18cbecdec5f2bca2687212efba1728..9a1e0e3f8e92a22746a8787bd3b81b4f1143945d 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -130,6 +130,7 @@ class API < Grape::API
       mount ::API::GroupBoards
       mount ::API::GroupClusters
       mount ::API::GroupExport
+      mount ::API::GroupImport
       mount ::API::GroupLabels
       mount ::API::GroupMilestones
       mount ::API::Groups
diff --git a/lib/api/group_import.rb b/lib/api/group_import.rb
new file mode 100644
index 0000000000000000000000000000000000000000..de7fdc2724335b0bcce715691c89871e55aba05e
--- /dev/null
+++ b/lib/api/group_import.rb
@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+module API
+  class GroupImport < Grape::API
+    MAXIMUM_FILE_SIZE = 50.megabytes.freeze
+
+    helpers do
+      def authorize_create_group!
+        parent_group = find_group!(params[:parent_id]) if params[:parent_id].present?
+
+        if parent_group
+          authorize! :create_subgroup, parent_group
+        else
+          authorize! :create_group
+        end
+      end
+    end
+
+    resource :groups, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
+      desc 'Workhorse authorize the group import upload' do
+        detail 'This feature was introduced in GitLab 12.8'
+      end
+      post 'import/authorize' do
+        require_gitlab_workhorse!
+
+        Gitlab::Workhorse.verify_api_request!(headers)
+
+        status 200
+        content_type Gitlab::Workhorse::INTERNAL_API_CONTENT_TYPE
+
+        ImportExportUploader.workhorse_authorize(has_length: false, maximum_size: MAXIMUM_FILE_SIZE)
+      end
+
+      desc 'Create a new group import' do
+        detail 'This feature was introduced in GitLab 12.8'
+        success Entities::Group
+      end
+      params do
+        requires :path, type: String, desc: 'Group path'
+        requires :name, type: String, desc: 'Group name'
+        optional :parent_id, type: Integer, desc: "The ID of the parent group that the group will be imported into. Defaults to the current user's namespace."
+        optional 'file.path', type: String, desc: 'Path to locally stored body (generated by Workhorse)'
+        optional 'file.name', type: String, desc: 'Real filename as send in Content-Disposition (generated by Workhorse)'
+        optional 'file.type', type: String, desc: 'Real content type as send in Content-Type (generated by Workhorse)'
+        optional 'file.size', type: Integer, desc: 'Real size of file (generated by Workhorse)'
+        optional 'file.md5', type: String, desc: 'MD5 checksum of the file (generated by Workhorse)'
+        optional 'file.sha1', type: String, desc: 'SHA1 checksum of the file (generated by Workhorse)'
+        optional 'file.sha256', type: String, desc: 'SHA256 checksum of the file (generated by Workhorse)'
+      end
+      post 'import' do
+        authorize_create_group!
+        require_gitlab_workhorse!
+
+        uploaded_file = UploadedFile.from_params(params, :file, ImportExportUploader.workhorse_local_upload_path)
+
+        bad_request!('Unable to process group import file') unless uploaded_file
+
+        group_params = {
+          path: params[:path],
+          name: params[:name],
+          parent_id: params[:parent_id],
+          import_export_upload: ImportExportUpload.new(import_file: uploaded_file)
+        }
+
+        group = ::Groups::CreateService.new(current_user, group_params).execute
+
+        if group.persisted?
+          GroupImportWorker.perform_async(current_user.id, group.id)
+
+          accepted!
+        else
+          render_api_error!("Failed to save group #{group.errors.messages}", 400)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/api/helpers/file_upload_helpers.rb b/lib/api/helpers/file_upload_helpers.rb
new file mode 100644
index 0000000000000000000000000000000000000000..c5fb291a2b7ce98024459d4ab1b3ee6e3d290d99
--- /dev/null
+++ b/lib/api/helpers/file_upload_helpers.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module API
+  module Helpers
+    module FileUploadHelpers
+      def file_is_valid?
+        params[:file] && params[:file]['tempfile'].respond_to?(:read)
+      end
+
+      def validate_file!
+        render_api_error!('Uploaded file is invalid', 400) unless file_is_valid?
+      end
+    end
+  end
+end
diff --git a/lib/api/project_import.rb b/lib/api/project_import.rb
index 7e0bd299761bdebdefe625658469070e5b9294b4..ea793a09f6cf5773597f63e431446f0aaae0eb79 100644
--- a/lib/api/project_import.rb
+++ b/lib/api/project_import.rb
@@ -5,20 +5,13 @@ class ProjectImport < Grape::API
     include PaginationParams
 
     helpers Helpers::ProjectsHelpers
+    helpers Helpers::FileUploadHelpers
 
     helpers do
       def import_params
         declared_params(include_missing: false)
       end
 
-      def file_is_valid?
-        import_params[:file] && import_params[:file]['tempfile'].respond_to?(:read)
-      end
-
-      def validate_file!
-        render_api_error!('The file is invalid', 400) unless file_is_valid?
-      end
-
       def throttled?(key, scope)
         rate_limiter.throttled?(key, scope: scope)
       end
diff --git a/spec/requests/api/group_import_spec.rb b/spec/requests/api/group_import_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..016ed6ff49131bd446f17f8dd3dba8dfe81872a7
--- /dev/null
+++ b/spec/requests/api/group_import_spec.rb
@@ -0,0 +1,268 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe API::GroupImport do
+  include WorkhorseHelpers
+
+  let_it_be(:user) { create(:user) }
+  let_it_be(:group) { create(:group) }
+  let(:path) { '/groups/import' }
+  let(:file) { File.join('spec', 'fixtures', 'group_export.tar.gz') }
+  let(:export_path) { "#{Dir.tmpdir}/group_export_spec" }
+  let(:workhorse_token) { JWT.encode({ 'iss' => 'gitlab-workhorse' }, Gitlab::Workhorse.secret, 'HS256') }
+  let(:workhorse_header) { { 'GitLab-Workhorse' => '1.0', Gitlab::Workhorse::INTERNAL_API_REQUEST_HEADER => workhorse_token } }
+
+  before do
+    allow_next_instance_of(Gitlab::ImportExport) do |import_export|
+      expect(import_export).to receive(:storage_path).and_return(export_path)
+    end
+
+    stub_uploads_object_storage(ImportExportUploader)
+  end
+
+  after do
+    FileUtils.rm_rf(export_path, secure: true)
+  end
+
+  describe 'POST /groups/import' do
+    let(:file_upload) { fixture_file_upload(file) }
+    let(:params) do
+      {
+        path: 'test-import-group',
+        name: 'test-import-group',
+        file: fixture_file_upload(file)
+      }
+    end
+
+    subject { post api('/groups/import', user), params: params, headers: workhorse_header }
+
+    shared_examples 'when all params are correct' do
+      context 'when user is authorized to create new group' do
+        it 'creates new group and accepts request' do
+          subject
+
+          expect(response).to have_gitlab_http_status(202)
+        end
+
+        context 'when importing to a parent group' do
+          before do
+            group.add_owner(user)
+          end
+
+          it 'creates new group and accepts request' do
+            params[:parent_id] = group.id
+
+            subject
+
+            expect(response).to have_gitlab_http_status(202)
+            expect(group.children.count).to eq(1)
+          end
+
+          context 'when parent group is invalid' do
+            it 'returns 404 and does not create new group' do
+              params[:parent_id] = 99999
+
+              expect { subject }.not_to change { Group.count }
+
+              expect(response).to have_gitlab_http_status(404)
+              expect(json_response['message']).to eq('404 Group Not Found')
+            end
+
+            context 'when user is not an owner of parent group' do
+              it 'returns 403 Forbidden HTTP status' do
+                params[:parent_id] = create(:group).id
+
+                subject
+
+                expect(response).to have_gitlab_http_status(403)
+                expect(json_response['message']).to eq('403 Forbidden')
+              end
+            end
+          end
+        end
+
+        context 'when group creation failed' do
+          before do
+            allow_next_instance_of(Group) do |group|
+              allow(group).to receive(:persisted?).and_return(false)
+            end
+          end
+
+          it 'returns 400 HTTP status' do
+            subject
+
+            expect(response).to have_gitlab_http_status(400)
+          end
+        end
+      end
+
+      context 'when user is not authorized to create new group' do
+        let(:user) { create(:user, can_create_group: false) }
+
+        it 'forbids the request' do
+          subject
+
+          expect(response).to have_gitlab_http_status(403)
+        end
+      end
+    end
+
+    shared_examples 'when some params are missing' do
+      context 'when required params are missing' do
+        shared_examples 'missing parameter' do |params, error_message|
+          it 'returns 400 HTTP status' do
+            params[:file] = file_upload
+
+            expect do
+              post api('/groups/import', user), params: params, headers: workhorse_header
+            end.not_to change { Group.count }.from(1)
+
+            expect(response).to have_gitlab_http_status(400)
+            expect(json_response['error']).to eq(error_message)
+          end
+        end
+
+        include_examples 'missing parameter', { name: 'test' }, 'path is missing'
+        include_examples 'missing parameter', { path: 'test' }, 'name is missing'
+      end
+    end
+
+    context 'with object storage disabled' do
+      before do
+        stub_uploads_object_storage(ImportExportUploader, enabled: false)
+      end
+
+      context 'without a file from workhorse' do
+        it 'rejects the request' do
+          subject
+
+          expect(response).to have_gitlab_http_status(:bad_request)
+        end
+      end
+
+      context 'without a workhorse header' do
+        it 'rejects request without a workhorse header' do
+          post api('/groups/import', user), params: params
+
+          expect(response).to have_gitlab_http_status(:forbidden)
+        end
+      end
+
+      context 'when params from workhorse are correct' do
+        let(:params) do
+          {
+            path: 'test-import-group',
+            name: 'test-import-group',
+            'file.path' => file_upload.path,
+            'file.name' => file_upload.original_filename
+          }
+        end
+
+        include_examples 'when all params are correct'
+        include_examples 'when some params are missing'
+      end
+
+      it "doesn't attempt to migrate file to object storage" do
+        expect(ObjectStorage::BackgroundMoveWorker).not_to receive(:perform_async)
+
+        subject
+      end
+    end
+
+    context 'with object storage enabled' do
+      before do
+        stub_uploads_object_storage(ImportExportUploader, enabled: true)
+
+        allow(ImportExportUploader).to receive(:workhorse_upload_path).and_return('/')
+      end
+
+      context 'with direct upload enabled' do
+        let(:file_name) { 'group_export.tar.gz' }
+        let!(:fog_connection) do
+          stub_uploads_object_storage(ImportExportUploader, direct_upload: true)
+        end
+        let(:tmp_object) do
+          fog_connection.directories.new(key: 'uploads').files.create(
+            key: "tmp/uploads/#{file_name}",
+            body: file_upload
+          )
+        end
+        let(:fog_file) { fog_to_uploaded_file(tmp_object) }
+        let(:params) do
+          {
+            path: 'test-import-group',
+            name: 'test-import-group',
+            file: fog_file,
+            'file.remote_id' => file_name,
+            'file.size' => fog_file.size
+          }
+        end
+
+        it 'accepts the request and stores the file' do
+          expect { subject }.to change { Group.count }.by(1)
+
+          expect(response).to have_gitlab_http_status(:accepted)
+        end
+
+        include_examples 'when all params are correct'
+        include_examples 'when some params are missing'
+      end
+    end
+  end
+
+  describe 'POST /groups/import/authorize' do
+    subject { post api('/groups/import/authorize', user), headers: workhorse_header }
+
+    it 'authorizes importing group with workhorse header' do
+      subject
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(response.content_type.to_s).to eq(Gitlab::Workhorse::INTERNAL_API_CONTENT_TYPE)
+    end
+
+    it 'rejects requests that bypassed gitlab-workhorse' do
+      workhorse_header.delete(Gitlab::Workhorse::INTERNAL_API_REQUEST_HEADER)
+
+      subject
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+    end
+
+    context 'when using remote storage' do
+      context 'when direct upload is enabled' do
+        before do
+          stub_uploads_object_storage(ImportExportUploader, enabled: true, direct_upload: true)
+        end
+
+        it 'responds with status 200, location of file remote store and object details' do
+          subject
+
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(response.content_type.to_s).to eq(Gitlab::Workhorse::INTERNAL_API_CONTENT_TYPE)
+          expect(json_response).not_to have_key('TempPath')
+          expect(json_response['RemoteObject']).to have_key('ID')
+          expect(json_response['RemoteObject']).to have_key('GetURL')
+          expect(json_response['RemoteObject']).to have_key('StoreURL')
+          expect(json_response['RemoteObject']).to have_key('DeleteURL')
+          expect(json_response['RemoteObject']).to have_key('MultipartUpload')
+        end
+      end
+
+      context 'when direct upload is disabled' do
+        before do
+          stub_uploads_object_storage(ImportExportUploader, enabled: true, direct_upload: false)
+        end
+
+        it 'handles as a local file' do
+          subject
+
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(response.content_type.to_s).to eq(Gitlab::Workhorse::INTERNAL_API_CONTENT_TYPE)
+          expect(json_response['TempPath']).to eq(ImportExportUploader.workhorse_local_upload_path)
+          expect(json_response['RemoteObject']).to be_nil
+        end
+      end
+    end
+  end
+end