diff --git a/app/models/concerns/integrations/has_data_fields.rb b/app/models/concerns/integrations/has_data_fields.rb
index e9aaaac8226300101178f17433acc396d9a0cd01..1709b56080eb5d01ebfbdaec77c3058eb51f59dd 100644
--- a/app/models/concerns/integrations/has_data_fields.rb
+++ b/app/models/concerns/integrations/has_data_fields.rb
@@ -46,6 +46,7 @@ def #{arg}_was
       has_one :issue_tracker_data, autosave: true, inverse_of: :integration, foreign_key: :service_id, class_name: 'Integrations::IssueTrackerData'
       has_one :jira_tracker_data, autosave: true, inverse_of: :integration, foreign_key: :service_id, class_name: 'Integrations::JiraTrackerData'
       has_one :open_project_tracker_data, autosave: true, inverse_of: :integration, foreign_key: :service_id, class_name: 'Integrations::OpenProjectTrackerData'
+      has_one :zentao_tracker_data, autosave: true, inverse_of: :integration, foreign_key: :integration_id, class_name: 'Integrations::ZentaoTrackerData'
 
       def data_fields
         raise NotImplementedError
diff --git a/app/models/integrations/zentao.rb b/app/models/integrations/zentao.rb
new file mode 100644
index 0000000000000000000000000000000000000000..68c02f54c61246ae52edc3a152e2f8d4870093ae
--- /dev/null
+++ b/app/models/integrations/zentao.rb
@@ -0,0 +1,78 @@
+# frozen_string_literal: true
+
+module Integrations
+  class Zentao < Integration
+    data_field :url, :api_url, :api_token, :zentao_product_xid
+
+    validates :url, public_url: true, presence: true, if: :activated?
+    validates :api_url, public_url: true, allow_blank: true
+    validates :api_token, presence: true, if: :activated?
+    validates :zentao_product_xid, presence: true, if: :activated?
+
+    def data_fields
+      zentao_tracker_data || self.build_zentao_tracker_data
+    end
+
+    def title
+      self.class.name.demodulize
+    end
+
+    def description
+      s_("ZentaoIntegration|Use Zentao as this project's issue tracker.")
+    end
+
+    def self.to_param
+      name.demodulize.downcase
+    end
+
+    def test(*_args)
+      client.ping
+    end
+
+    def self.supported_events
+      %w()
+    end
+
+    def self.supported_event_actions
+      %w()
+    end
+
+    def fields
+      [
+        {
+          type: 'text',
+          name: 'url',
+          title: s_('ZentaoIntegration|Zentao Web URL'),
+          placeholder: 'https://www.zentao.net',
+          help: s_('ZentaoIntegration|Base URL of the Zentao instance.'),
+          required: true
+        },
+        {
+          type: 'text',
+          name: 'api_url',
+          title: s_('ZentaoIntegration|Zentao API URL (optional)'),
+          help: s_('ZentaoIntegration|If different from Web URL.')
+        },
+        {
+          type: 'password',
+          name: 'api_token',
+          title: s_('ZentaoIntegration|Zentao API token'),
+          non_empty_password_title: s_('ZentaoIntegration|Enter API token'),
+          required: true
+        },
+        {
+          type: 'text',
+          name: 'zentao_product_xid',
+          title: s_('ZentaoIntegration|Zentao Product ID'),
+          required: true
+        }
+      ]
+    end
+
+    private
+
+    def client
+      @client ||= ::Gitlab::Zentao::Client.new(self)
+    end
+  end
+end
diff --git a/app/models/integrations/zentao_tracker_data.rb b/app/models/integrations/zentao_tracker_data.rb
new file mode 100644
index 0000000000000000000000000000000000000000..468e4e5d7d7ff177b70258dfecde3787a7e751f7
--- /dev/null
+++ b/app/models/integrations/zentao_tracker_data.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+module Integrations
+  class ZentaoTrackerData < ApplicationRecord
+    belongs_to :integration, inverse_of: :zentao_tracker_data, foreign_key: :integration_id
+    delegate :activated?, to: :integration
+    validates :integration, presence: true
+
+    scope :encryption_options, -> do
+      {
+        key: Settings.attr_encrypted_db_key_base_32,
+        encode: true,
+        mode: :per_attribute_iv,
+        algorithm: 'aes-256-gcm'
+      }
+    end
+
+    attr_encrypted :url, encryption_options
+    attr_encrypted :api_url, encryption_options
+    attr_encrypted :zentao_product_xid, encryption_options
+    attr_encrypted :api_token, encryption_options
+  end
+end
diff --git a/app/models/project.rb b/app/models/project.rb
index 6615f9dabb21857008b284179ea0d6d44280801a..6d4d25695dfbeec8b69e7b4d05aa9d4fe0d7207d 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -209,6 +209,7 @@ def self.integration_association_name(name)
   has_one :unify_circuit_integration, class_name: 'Integrations::UnifyCircuit'
   has_one :webex_teams_integration, class_name: 'Integrations::WebexTeams'
   has_one :youtrack_integration, class_name: 'Integrations::Youtrack'
+  has_one :zentao_integration, class_name: 'Integrations::Zentao'
 
   has_one :root_of_fork_network,
           foreign_key: 'root_project_id',
@@ -1455,7 +1456,7 @@ def find_or_initialize_integrations
   end
 
   def disabled_integrations
-    []
+    [:zentao]
   end
 
   def find_or_initialize_integration(name)
diff --git a/ee/app/models/ee/project.rb b/ee/app/models/ee/project.rb
index 54e9224c8eff4bfa054ebf5f640b9cb7eb30f91b..bbc4fa565c75aaa3460e167191d03898d99301af 100644
--- a/ee/app/models/ee/project.rb
+++ b/ee/app/models/ee/project.rb
@@ -387,6 +387,10 @@ def jira_issues_integration_available?
       feature_available?(:jira_issues_integration)
     end
 
+    def zentao_issues_integration_available?
+      feature_available?(:zentao_issues_integration)
+    end
+
     def multiple_approval_rules_available?
       feature_available?(:multiple_approval_rules)
     end
diff --git a/ee/app/models/license.rb b/ee/app/models/license.rb
index de9bd88972b111165bbd529a993524f2ea2dc8b1..4744ee0fbbbd5f63ad697a2c3cbc42b7edc6fe96 100644
--- a/ee/app/models/license.rb
+++ b/ee/app/models/license.rb
@@ -137,6 +137,7 @@ class License < ApplicationRecord
     oncall_schedules
     escalation_policies
     export_user_permissions
+    zentao_issues_integration
   ]
   EEP_FEATURES.freeze
 
diff --git a/lib/gitlab/integrations/sti_type.rb b/lib/gitlab/integrations/sti_type.rb
index 0fa9f435b5c68181eb32d126e1a53fa887622241..91797a7b99bcafd911aa68a3eed1361f063e07b7 100644
--- a/lib/gitlab/integrations/sti_type.rb
+++ b/lib/gitlab/integrations/sti_type.rb
@@ -7,7 +7,7 @@ class StiType < ActiveRecord::Type::String
         Asana Assembla Bamboo Bugzilla Buildkite Campfire Confluence CustomIssueTracker Datadog
         Discord DroneCi EmailsOnPush Ewm ExternalWiki Flowdock HangoutsChat Irker Jenkins Jira Mattermost
         MattermostSlashCommands MicrosoftTeams MockCi MockMonitoring Packagist PipelinesEmail Pivotaltracker
-        Prometheus Pushover Redmine Slack SlackSlashCommands Teamcity UnifyCircuit WebexTeams Youtrack
+        Prometheus Pushover Redmine Slack SlackSlashCommands Teamcity UnifyCircuit WebexTeams Youtrack Zentao
       )).freeze
 
       def self.namespaced_integrations
diff --git a/lib/gitlab/zentao/client.rb b/lib/gitlab/zentao/client.rb
new file mode 100644
index 0000000000000000000000000000000000000000..bdfa4b3a308e853188261641dab898abf66013af
--- /dev/null
+++ b/lib/gitlab/zentao/client.rb
@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Zentao
+    class Client
+      Error = Class.new(StandardError)
+      ConfigError = Class.new(Error)
+
+      attr_reader :integration
+
+      def initialize(integration)
+        raise ConfigError, 'Please check your integration configuration.' unless integration
+
+        @integration = integration
+      end
+
+      def ping
+        response = fetch_product(zentao_product_xid)
+
+        active = response.fetch('deleted') == '0' rescue false
+
+        if active
+          { success: true }
+        else
+          { success: false, message: 'Not Found' }
+        end
+      end
+
+      def fetch_product(product_id)
+        get("products/#{product_id}")
+      end
+
+      def fetch_issues(params = {})
+        get("products/#{zentao_product_xid}/issues",
+            params.reverse_merge(page: 1, limit: 20))
+      end
+
+      def fetch_issue(issue_id)
+        get("issues/#{issue_id}")
+      end
+
+      private
+
+      def get(path, params = {})
+        options = { headers: headers, query: params }
+        response = Gitlab::HTTP.get(url(path), options)
+
+        return {} unless response.success?
+
+        Gitlab::Json.parse(response.body)
+      rescue JSON::ParserError
+        {}
+      end
+
+      def url(path)
+        host = integration.api_url.presence || integration.url
+
+        URI.join(host, '/api.php/v1/', path)
+      end
+
+      def headers
+        {
+          'Content-Type': 'application/json',
+          'Token': integration.api_token
+        }
+      end
+
+      def zentao_product_xid
+        integration.zentao_product_xid
+      end
+    end
+  end
+end
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 6c1ac4de1a5107dc6b1e566b4cf5f7b6f1747c26..db84b9e2d69ad07f01950a3a3b4b00457df7ce64 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -38898,6 +38898,30 @@ msgstr ""
 msgid "Your username is %{username}."
 msgstr ""
 
+msgid "ZentaoIntegration|Base URL of the Zentao instance."
+msgstr ""
+
+msgid "ZentaoIntegration|Enter API token"
+msgstr ""
+
+msgid "ZentaoIntegration|If different from Web URL."
+msgstr ""
+
+msgid "ZentaoIntegration|Use Zentao as this project's issue tracker."
+msgstr ""
+
+msgid "ZentaoIntegration|Zentao API URL (optional)"
+msgstr ""
+
+msgid "ZentaoIntegration|Zentao API token"
+msgstr ""
+
+msgid "ZentaoIntegration|Zentao Product ID"
+msgstr ""
+
+msgid "ZentaoIntegration|Zentao Web URL"
+msgstr ""
+
 msgid "Zoom meeting added"
 msgstr ""
 
diff --git a/spec/factories/integration_data.rb b/spec/factories/integration_data.rb
index a7406794437c389270049a7c927295075ac9adbe..4d0892556f8e12a621fd2adb6186807c45705a38 100644
--- a/spec/factories/integration_data.rb
+++ b/spec/factories/integration_data.rb
@@ -7,13 +7,21 @@
     integration factory: :jira_integration
   end
 
+  factory :zentao_tracker_data, class: 'Integrations::ZentaoTrackerData' do
+    integration factory: :zentao_integration
+    url { 'https://jihudemo.zentao.net' }
+    api_url { '' }
+    api_token { 'ZENTAO_TOKEN' }
+    zentao_product_xid { '3' }
+  end
+
   factory :issue_tracker_data, class: 'Integrations::IssueTrackerData' do
     integration
   end
 
   factory :open_project_tracker_data, class: 'Integrations::OpenProjectTrackerData' do
     integration factory: :open_project_service
-    url { 'http://openproject.example.com'}
+    url { 'http://openproject.example.com' }
     token { 'supersecret' }
     project_identifier_code { 'PRJ-1' }
     closed_status_id { '15' }
diff --git a/spec/factories/integrations.rb b/spec/factories/integrations.rb
index ca8ffb135f95be61e11915e8dd231f5c15a24ee6..cb1c94c25c1018b6fefd5533c65d74750b2f9089 100644
--- a/spec/factories/integrations.rb
+++ b/spec/factories/integrations.rb
@@ -85,6 +85,32 @@
     end
   end
 
+  factory :zentao_integration, class: 'Integrations::Zentao' do
+    project
+    active { true }
+    type { 'ZentaoService' }
+
+    transient do
+      create_data { true }
+      url { 'https://jihudemo.zentao.net' }
+      api_url { '' }
+      api_token { 'ZENTAO_TOKEN' }
+      zentao_product_xid { '3' }
+    end
+
+    after(:build) do |integration, evaluator|
+      if evaluator.create_data
+        integration.zentao_tracker_data = build(:zentao_tracker_data,
+          integration: integration,
+          url: evaluator.url,
+          api_url: evaluator.api_url,
+          api_token: evaluator.api_token,
+          zentao_product_xid: evaluator.zentao_product_xid
+        )
+      end
+    end
+  end
+
   factory :confluence_integration, class: 'Integrations::Confluence' do
     project
     active { true }
diff --git a/spec/lib/gitlab/import_export/all_models.yml b/spec/lib/gitlab/import_export/all_models.yml
index cf340b47b68d1af255f076e33ae133e11fb04ff3..3b8fd8f7fc47d336baaa1282797d55dbccca28a8 100644
--- a/spec/lib/gitlab/import_export/all_models.yml
+++ b/spec/lib/gitlab/import_export/all_models.yml
@@ -319,6 +319,7 @@ integrations:
 - project
 - service_hook
 - jira_tracker_data
+- zentao_tracker_data
 - issue_tracker_data
 - open_project_tracker_data
 hooks:
@@ -398,6 +399,7 @@ project:
 - teamcity_integration
 - pushover_integration
 - jira_integration
+- zentao_integration
 - redmine_integration
 - youtrack_integration
 - custom_issue_tracker_integration
diff --git a/spec/lib/gitlab/zentao/client_spec.rb b/spec/lib/gitlab/zentao/client_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..e3a335c1e89ae890227b42fc969494f40f159d51
--- /dev/null
+++ b/spec/lib/gitlab/zentao/client_spec.rb
@@ -0,0 +1,105 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Zentao::Client do
+  subject(:integration) { described_class.new(zentao_integration) }
+
+  let(:zentao_integration) { create(:zentao_integration) }
+  let(:mock_get_products_url) { integration.send(:url, "products/#{zentao_integration.zentao_product_xid}") }
+
+  describe '#new' do
+    context 'if integration is nil' do
+      let(:zentao_integration) { nil }
+
+      it 'raises ConfigError' do
+        expect { integration }.to raise_error(described_class::ConfigError)
+      end
+    end
+
+    context 'integration is provided' do
+      it 'is initialized successfully' do
+        expect { integration }.not_to raise_error
+      end
+    end
+  end
+
+  describe '#fetch_product' do
+    let(:mock_headers) do
+      {
+        headers: {
+          'Content-Type' => 'application/json',
+          'Token' => zentao_integration.api_token
+        }
+      }
+    end
+
+    context 'with valid product' do
+      let(:mock_response) { { 'id' => zentao_integration.zentao_product_xid } }
+
+      before do
+        WebMock.stub_request(:get, mock_get_products_url)
+               .with(mock_headers).to_return(status: 200, body: mock_response.to_json)
+      end
+
+      it 'fetches the product' do
+        expect(integration.fetch_product(zentao_integration.zentao_product_xid)).to eq mock_response
+      end
+    end
+
+    context 'with invalid product' do
+      before do
+        WebMock.stub_request(:get, mock_get_products_url)
+               .with(mock_headers).to_return(status: 404, body: {}.to_json)
+      end
+
+      it 'fetches the empty product' do
+        expect(integration.fetch_product(zentao_integration.zentao_product_xid)).to eq({})
+      end
+    end
+
+    context 'with invalid response' do
+      before do
+        WebMock.stub_request(:get, mock_get_products_url)
+               .with(mock_headers).to_return(status: 200, body: '[invalid json}')
+      end
+
+      it 'fetches the empty product' do
+        expect(integration.fetch_product(zentao_integration.zentao_product_xid)).to eq({})
+      end
+    end
+  end
+
+  describe '#ping' do
+    let(:mock_headers) do
+      {
+        headers: {
+          'Content-Type' => 'application/json',
+          'Token' => zentao_integration.api_token
+        }
+      }
+    end
+
+    context 'with valid resource' do
+      before do
+        WebMock.stub_request(:get, mock_get_products_url)
+               .with(mock_headers).to_return(status: 200, body: { 'deleted' => '0' }.to_json)
+      end
+
+      it 'responds with success' do
+        expect(integration.ping[:success]).to eq true
+      end
+    end
+
+    context 'with deleted resource' do
+      before do
+        WebMock.stub_request(:get, mock_get_products_url)
+               .with(mock_headers).to_return(status: 200, body: { 'deleted' => '1' }.to_json)
+      end
+
+      it 'responds with unsuccess' do
+        expect(integration.ping[:success]).to eq false
+      end
+    end
+  end
+end
diff --git a/spec/migrations/add_triggers_to_integrations_type_new_spec.rb b/spec/migrations/add_triggers_to_integrations_type_new_spec.rb
index 07845715a524f7d119596934c215ae2d90fe52d8..01af588417023a1943b7917b21087e41c21519c9 100644
--- a/spec/migrations/add_triggers_to_integrations_type_new_spec.rb
+++ b/spec/migrations/add_triggers_to_integrations_type_new_spec.rb
@@ -8,6 +8,18 @@
   let(:migration) { described_class.new }
   let(:integrations) { table(:integrations) }
 
+  # This matches Gitlab::Integrations::StiType at the time the trigger was added
+  let(:namespaced_integrations) do
+    %w[
+      Asana Assembla Bamboo Bugzilla Buildkite Campfire Confluence CustomIssueTracker Datadog
+      Discord DroneCi EmailsOnPush Ewm ExternalWiki Flowdock HangoutsChat Irker Jenkins Jira Mattermost
+      MattermostSlashCommands MicrosoftTeams MockCi MockMonitoring Packagist PipelinesEmail Pivotaltracker
+      Prometheus Pushover Redmine Slack SlackSlashCommands Teamcity UnifyCircuit WebexTeams Youtrack
+
+      Github GitlabSlackApplication
+    ]
+  end
+
   describe '#up' do
     before do
       migrate!
@@ -15,7 +27,7 @@
 
     describe 'INSERT trigger' do
       it 'sets `type_new` to the transformed `type` class name' do
-        Gitlab::Integrations::StiType.namespaced_integrations.each do |type|
+        namespaced_integrations.each do |type|
           integration = integrations.create!(type: "#{type}Service")
 
           expect(integration.reload).to have_attributes(
diff --git a/spec/models/integrations/zentao_spec.rb b/spec/models/integrations/zentao_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..a1503ecc0920f1d9d6567872e3c1e579a80289c4
--- /dev/null
+++ b/spec/models/integrations/zentao_spec.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Integrations::Zentao do
+  let(:url) { 'https://jihudemo.zentao.net' }
+  let(:api_url) { 'https://jihudemo.zentao.net' }
+  let(:api_token) { 'ZENTAO_TOKEN' }
+  let(:zentao_product_xid) { '3' }
+  let(:zentao_integration) { create(:zentao_integration) }
+
+  describe '#create' do
+    let(:project) { create(:project, :repository) }
+    let(:params) do
+      {
+        project: project,
+        url: url,
+        api_url: api_url,
+        api_token: api_token,
+        zentao_product_xid: zentao_product_xid
+      }
+    end
+
+    it 'stores data in data_fields correctly' do
+      tracker_data = described_class.create!(params).zentao_tracker_data
+
+      expect(tracker_data.url).to eq(url)
+      expect(tracker_data.api_url).to eq(api_url)
+      expect(tracker_data.api_token).to eq(api_token)
+      expect(tracker_data.zentao_product_xid).to eq(zentao_product_xid)
+    end
+  end
+
+  describe '#fields' do
+    it 'returns custom fields' do
+      expect(zentao_integration.fields.pluck(:name)).to eq(%w[url api_url api_token zentao_product_xid])
+    end
+  end
+
+  describe '#test' do
+    let(:test_response) { { success: true } }
+
+    before do
+      allow_next_instance_of(Gitlab::Zentao::Client) do |client|
+        allow(client).to receive(:ping).and_return(test_response)
+      end
+    end
+
+    it 'gets response from Gitlab::Zentao::Client#ping' do
+      expect(zentao_integration.test).to eq(test_response)
+    end
+  end
+end
diff --git a/spec/models/integrations/zentao_tracker_data_spec.rb b/spec/models/integrations/zentao_tracker_data_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..b078c57830b094048c4c1e70d34a3d19489fe6db
--- /dev/null
+++ b/spec/models/integrations/zentao_tracker_data_spec.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Integrations::ZentaoTrackerData do
+  describe 'factory available' do
+    let(:zentao_tracker_data) { create(:zentao_tracker_data) }
+
+    it { expect(zentao_tracker_data.valid?).to eq true }
+  end
+
+  describe 'associations' do
+    it { is_expected.to belong_to(:integration) }
+  end
+
+  describe 'encrypted attributes' do
+    subject { described_class.encrypted_attributes.keys }
+
+    it { is_expected.to contain_exactly(:url, :api_url, :zentao_product_xid, :api_token) }
+  end
+end