diff --git a/app/assets/javascripts/pages/ci/lints/ci_lint_editor.js b/app/assets/javascripts/pages/projects/ci/lints/ci_lint_editor.js
similarity index 100%
rename from app/assets/javascripts/pages/ci/lints/ci_lint_editor.js
rename to app/assets/javascripts/pages/projects/ci/lints/ci_lint_editor.js
diff --git a/app/assets/javascripts/pages/ci/lints/new/index.js b/app/assets/javascripts/pages/projects/ci/lints/new/index.js
similarity index 100%
rename from app/assets/javascripts/pages/ci/lints/new/index.js
rename to app/assets/javascripts/pages/projects/ci/lints/new/index.js
diff --git a/app/assets/javascripts/pages/ci/lints/show/index.js b/app/assets/javascripts/pages/projects/ci/lints/show/index.js
similarity index 100%
rename from app/assets/javascripts/pages/ci/lints/show/index.js
rename to app/assets/javascripts/pages/projects/ci/lints/show/index.js
diff --git a/app/assets/stylesheets/pages/lint.scss b/app/assets/stylesheets/pages/lint.scss
deleted file mode 100644
index 68b6c5ecbd43bd2c6ebc1d26e91337d80a64e858..0000000000000000000000000000000000000000
--- a/app/assets/stylesheets/pages/lint.scss
+++ /dev/null
@@ -1,21 +0,0 @@
-.ci-body {
-  .incorrect-syntax {
-    font-size: 18px;
-    color: $lint-incorrect-color;
-  }
-
-  .correct-syntax {
-    font-size: 18px;
-    color: $lint-correct-color;
-  }
-}
-
-.ci-linter {
-  .ci-editor {
-    height: 400px;
-  }
-
-  .ci-template pre {
-    white-space: pre-wrap;
-  }
-}
diff --git a/app/assets/stylesheets/pages/projects.scss b/app/assets/stylesheets/pages/projects.scss
index 584b0579b725a72fbefc3856d8f354130c198149..9a770d7768587a1e3f0c528e5cb07357d7a75074 100644
--- a/app/assets/stylesheets/pages/projects.scss
+++ b/app/assets/stylesheets/pages/projects.scss
@@ -1121,3 +1121,25 @@ pre.light-well {
   padding-top: $gl-padding;
   padding-bottom: 37px;
 }
+
+.project-ci-body {
+  .incorrect-syntax {
+    font-size: 18px;
+    color: $lint-incorrect-color;
+  }
+
+  .correct-syntax {
+    font-size: 18px;
+    color: $lint-correct-color;
+  }
+}
+
+.project-ci-linter {
+  .ci-editor {
+    height: 400px;
+  }
+
+  .ci-template pre {
+    white-space: pre-wrap;
+  }
+}
diff --git a/app/controllers/ci/lints_controller.rb b/app/controllers/ci/lints_controller.rb
index e9bd1689a1ee1ca6b5f070bd8b1c9186267ff08e..738a6a5173eef4ea3c2688fa888c3aef8d5aa192 100644
--- a/app/controllers/ci/lints_controller.rb
+++ b/app/controllers/ci/lints_controller.rb
@@ -4,20 +4,5 @@ module Ci
 
     def show
     end
-
-    def create
-      @content = params[:content]
-      @error = Gitlab::Ci::YamlProcessor.validation_message(@content)
-      @status = @error.blank?
-
-      if @error.blank?
-        @config_processor = Gitlab::Ci::YamlProcessor.new(@content)
-        @stages = @config_processor.stages
-        @builds = @config_processor.builds
-        @jobs = @config_processor.jobs
-      end
-
-      render :show
-    end
   end
 end
diff --git a/app/controllers/projects/ci/lints_controller.rb b/app/controllers/projects/ci/lints_controller.rb
new file mode 100644
index 0000000000000000000000000000000000000000..a2185572a20363bdb0fed771795d5d4ce78e2981
--- /dev/null
+++ b/app/controllers/projects/ci/lints_controller.rb
@@ -0,0 +1,27 @@
+class Projects::Ci::LintsController < Projects::ApplicationController
+  before_action :authorize_create_pipeline!
+
+  def show
+  end
+
+  def create
+    @content = params[:content]
+    @error = Gitlab::Ci::YamlProcessor.validation_message(@content,  yaml_processor_options)
+    @status = @error.blank?
+
+    if @error.blank?
+      @config_processor = Gitlab::Ci::YamlProcessor.new(@content, yaml_processor_options)
+      @stages = @config_processor.stages
+      @builds = @config_processor.builds
+      @jobs = @config_processor.jobs
+    end
+
+    render :show
+  end
+
+  private
+
+  def yaml_processor_options
+    { project: @project, sha: project.repository.commit.sha }
+  end
+end
diff --git a/app/controllers/projects/settings/ci_cd_controller.rb b/app/controllers/projects/settings/ci_cd_controller.rb
index 259809f3429c5ccf96f2971ff976ecb8e033f108..96125b549b71b95e1ff6ba8081a03c919737dc4e 100644
--- a/app/controllers/projects/settings/ci_cd_controller.rb
+++ b/app/controllers/projects/settings/ci_cd_controller.rb
@@ -29,12 +29,12 @@ module Projects
         @project_runners = @project.runners.ordered
         @assignable_runners = current_user.ci_authorized_runners
           .assignable_for(project).ordered.page(params[:page]).per(20)
-        @shared_runners = Ci::Runner.shared.active
+        @shared_runners = ::Ci::Runner.shared.active
         @shared_runners_count = @shared_runners.count(:all)
       end
 
       def define_secret_variables
-        @variable = Ci::Variable.new(project: project)
+        @variable = ::Ci::Variable.new(project: project)
           .present(current_user: current_user)
         @variables = project.variables.order_key_asc
           .map { |variable| variable.present(current_user: current_user) }
@@ -42,7 +42,7 @@ module Projects
 
       def define_triggers_variables
         @triggers = @project.triggers
-        @trigger = Ci::Trigger.new
+        @trigger = ::Ci::Trigger.new
       end
 
       def define_badges_variables
diff --git a/app/views/ci/lints/show.html.haml b/app/views/ci/lints/show.html.haml
index 3c0881caa06e94ca9b7f7d2d9e33788419b41336..22f149d1caa35c431d53a3eb4146139879977f62 100644
--- a/app/views/ci/lints/show.html.haml
+++ b/app/views/ci/lints/show.html.haml
@@ -1,27 +1,9 @@
-- page_title "CI Lint"
-- page_description "Validate your GitLab CI configuration file"
-- content_for :library_javascripts do
-  = page_specific_javascript_tag('lib/ace.js')
-
-%h2 Check your .gitlab-ci.yml
-
-.ci-linter
-  .row
-    = form_tag ci_lint_path, method: :post do
-      .form-group
-        .col-sm-12
-          .file-holder
-            .js-file-title.file-title.clearfix
-              Content of .gitlab-ci.yml
-            #ci-editor.ci-editor= @content
-          = text_area_tag(:content, @content, class: 'hidden form-control span1', rows: 7, require: true)
-      .col-sm-12
-        .pull-left.prepend-top-10
-          = submit_tag('Validate', class: 'btn btn-success submit-yml')
-        .pull-right.prepend-top-10
-          = button_tag('Clear', type: 'button', class: 'btn btn-default clear-yml')
-
-  .row.prepend-top-20
-    .col-sm-12
-      .results.ci-template
-        = render partial: 'create' if defined?(@status)
+.row.empty-state
+  .col-xs-12
+    .svg-content
+      = image_tag 'illustrations/feature_moved.svg'
+  .col-xs-12
+    .text-content.text-center
+      %h4= _("GitLab CI Linter has been moved")
+      %p
+        = _("To validate your GitLab CI configurations, go to 'CI/CD → Pipelines' inside your project, and click on the 'CI Lint' button.")
diff --git a/app/views/ci/lints/_create.html.haml b/app/views/projects/ci/lints/_create.html.haml
similarity index 100%
rename from app/views/ci/lints/_create.html.haml
rename to app/views/projects/ci/lints/_create.html.haml
diff --git a/app/views/projects/ci/lints/show.html.haml b/app/views/projects/ci/lints/show.html.haml
new file mode 100644
index 0000000000000000000000000000000000000000..6ca8152183dc53e43d6e5a4b8b083aa9a6ec26a6
--- /dev/null
+++ b/app/views/projects/ci/lints/show.html.haml
@@ -0,0 +1,27 @@
+- page_title "CI Lint"
+- page_description "Validate your GitLab CI configuration file"
+- content_for :library_javascripts do
+  = page_specific_javascript_tag('lib/ace.js')
+
+%h2 Check your .gitlab-ci.yml
+
+.project-ci-linter
+  .row
+    = form_tag project_ci_lint_path(@project), method: :post do
+      .form-group
+        .col-sm-12
+          .file-holder
+            .js-file-title.file-title.clearfix
+              Content of .gitlab-ci.yml
+            #ci-editor.ci-editor= @content
+          = text_area_tag(:content, @content, class: 'hidden form-control span1', rows: 7, require: true)
+      .col-sm-12
+        .pull-left.prepend-top-10
+          = submit_tag('Validate', class: 'btn btn-success submit-yml')
+        .pull-right.prepend-top-10
+          = button_tag('Clear', type: 'button', class: 'btn btn-default clear-yml')
+
+  .row.prepend-top-20
+    .col-sm-12
+      .results.project-ci-template
+        = render partial: 'create' if defined?(@status)
diff --git a/app/views/projects/pipelines/index.html.haml b/app/views/projects/pipelines/index.html.haml
index 3e6b3346787fb4f40e1338159f4a8f9f59fc349e..c0ee81fe28d4003a9701c16aad4f3a82954f2ada 100644
--- a/app/views/projects/pipelines/index.html.haml
+++ b/app/views/projects/pipelines/index.html.haml
@@ -10,6 +10,6 @@
     "no-pipelines-svg-path" => image_path('illustrations/pipelines_pending.svg'),
     "can-create-pipeline" => can?(current_user, :create_pipeline, @project).to_s,
     "new-pipeline-path" => can?(current_user, :create_pipeline, @project) && new_project_pipeline_path(@project),
-    "ci-lint-path" => can?(current_user, :create_pipeline, @project) && ci_lint_path,
+    "ci-lint-path" => can?(current_user, :create_pipeline, @project) && project_ci_lint_path(@project),
     "reset-cache-path" => can?(current_user, :admin_pipeline, @project) && reset_cache_project_settings_ci_cd_path(@project) ,
     "has-gitlab-ci" => (@project.has_ci? && @project.builds_enabled?).to_s } }
diff --git a/changelogs/unreleased/43603-ci-lint-support.yml b/changelogs/unreleased/43603-ci-lint-support.yml
new file mode 100644
index 0000000000000000000000000000000000000000..8e4a92c0287167c656521dedba3629b6142f107b
--- /dev/null
+++ b/changelogs/unreleased/43603-ci-lint-support.yml
@@ -0,0 +1,5 @@
+---
+title: Move ci/lint under project's namespace
+merge_request: 17729
+author:
+type: added
diff --git a/config/routes/ci.rb b/config/routes/ci.rb
index 60c1724bc052d312877f388326f9161915611b30..ebd321ed097be4d975859477a13e380bfdacea18 100644
--- a/config/routes/ci.rb
+++ b/config/routes/ci.rb
@@ -1,5 +1,5 @@
 namespace :ci do
-  resource :lint, only: [:show, :create]
+  resource :lint, only: :show
 
   root to: redirect('')
 end
diff --git a/config/routes/project.rb b/config/routes/project.rb
index f50b9aded8d9a36f8c1b0b105756f7814aac04fe..48ba8ef06f91cf31e0343e3d2342d812a91c3814 100644
--- a/config/routes/project.rb
+++ b/config/routes/project.rb
@@ -280,6 +280,10 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
             post :keep
           end
         end
+
+        namespace :ci do
+          resource :lint, only: [:show, :create]
+        end
       end
 
       draw :legacy_builds
diff --git a/doc/ci/quick_start/README.md b/doc/ci/quick_start/README.md
index e504b81eae806920f2ab1d0a9136eb8ed798f012..f64e868d390067045922f07ebaec5aa85ff3c674 100644
--- a/doc/ci/quick_start/README.md
+++ b/doc/ci/quick_start/README.md
@@ -104,8 +104,8 @@ Jobs are used to create jobs, which are then picked by
 
 What is important is that each job is run independently from each other.
 
-If you want to check whether your `.gitlab-ci.yml` file is valid, there is a
-Lint tool under the page `/ci/lint` of your GitLab instance. You can also find
+If you want to check whether the `.gitlab-ci.yml` of your project is valid, there is a
+Lint tool under the page `/ci/lint` of your project namespace. You can also find
 a "CI Lint" button to go to this page under **CI/CD ➔ Pipelines** and
 **Pipelines ➔ Jobs** in your project.
 
diff --git a/doc/ci/yaml/README.md b/doc/ci/yaml/README.md
index 7184f3367be2e8ad9d0b906689888c8693f7a4d9..c2b06e53c2ffa71d22441457fe2754f4ead4b5f9 100644
--- a/doc/ci/yaml/README.md
+++ b/doc/ci/yaml/README.md
@@ -1526,8 +1526,9 @@ capitalization, the commit will be created but the pipeline will be skipped.
 
 ## Validate the .gitlab-ci.yml
 
-Each instance of GitLab CI has an embedded debug tool called Lint.
-You can find the link under `/ci/lint` of your gitlab instance.
+Each instance of GitLab CI has an embedded debug tool called Lint, which validates the
+content of your `.gitlab-ci.yml` files. You can find the Lint under the page `ci/lint` of your 
+project namespace (e.g, `http://gitlab-example.com/gitlab-org/project-123/ci/lint`)
 
 ## Using reserved keywords
 
diff --git a/lib/gitlab/ci/config.rb b/lib/gitlab/ci/config.rb
index f7ff7ea212e0e10acf078909bb6260bb96099eeb..66ac4a40616bd1bda03538f358690c974af83dbf 100644
--- a/lib/gitlab/ci/config.rb
+++ b/lib/gitlab/ci/config.rb
@@ -4,7 +4,8 @@ module Gitlab
     # Base GitLab CI Configuration facade
     #
     class Config
-      def initialize(config)
+      # EE would override this and utilize opts argument
+      def initialize(config, opts = {})
         @config = Loader.new(config).load!
 
         @global = Entry::Global.new(@config)
diff --git a/lib/gitlab/ci/yaml_processor.rb b/lib/gitlab/ci/yaml_processor.rb
index bc2a6f98dae77cf0441949f69a3f686d1ba80ccb..e829f2a95f884ec75d7e4a76b69ec2890267cce8 100644
--- a/lib/gitlab/ci/yaml_processor.rb
+++ b/lib/gitlab/ci/yaml_processor.rb
@@ -7,8 +7,8 @@ module Gitlab
 
       attr_reader :cache, :stages, :jobs
 
-      def initialize(config)
-        @ci_config = Gitlab::Ci::Config.new(config)
+      def initialize(config, opts = {})
+        @ci_config = Gitlab::Ci::Config.new(config, opts)
         @config = @ci_config.to_hash
 
         unless @ci_config.valid?
@@ -73,11 +73,11 @@ module Gitlab
         end
       end
 
-      def self.validation_message(content)
+      def self.validation_message(content, opts = {})
         return 'Please provide content of .gitlab-ci.yml' if content.blank?
 
         begin
-          Gitlab::Ci::YamlProcessor.new(content)
+          Gitlab::Ci::YamlProcessor.new(content, opts)
           nil
         rescue ValidationError => e
           e.message
diff --git a/spec/controllers/projects/ci/lints_controller_spec.rb b/spec/controllers/projects/ci/lints_controller_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..1249a5528a9b7833c3052b5cb824f831f54bc02d
--- /dev/null
+++ b/spec/controllers/projects/ci/lints_controller_spec.rb
@@ -0,0 +1,123 @@
+require 'spec_helper'
+
+describe Projects::Ci::LintsController do
+  let(:project) { create(:project, :repository) }
+  let(:user) { create(:user) }
+
+  before do
+    sign_in(user)
+  end
+
+  describe 'GET #show' do
+    context 'with enough privileges' do
+      before do
+        project.add_developer(user)
+
+        get :show, namespace_id: project.namespace, project_id: project
+      end
+
+      it 'should be success' do
+        expect(response).to be_success
+      end
+
+      it 'should render show page' do
+        expect(response).to render_template :show
+      end
+
+      it 'should retrieve project' do
+        expect(assigns(:project)).to eq(project)
+      end
+    end
+
+    context 'without enough privileges' do
+      before do
+        project.add_guest(user)
+
+        get :show, namespace_id: project.namespace, project_id: project
+      end
+
+      it 'should respond with 404' do
+        expect(response).to have_gitlab_http_status(404)
+      end
+    end
+  end
+
+  describe 'POST #create' do
+    let(:remote_file_path) { 'https://gitlab.com/gitlab-org/gitlab-ce/blob/1234/.gitlab-ci-1.yml' }
+
+    let(:remote_file_content) do
+      <<~HEREDOC
+      before_script:
+        - apt-get update -qq && apt-get install -y -qq sqlite3 libsqlite3-dev nodejs
+        - ruby -v
+        - which ruby
+        - gem install bundler --no-ri --no-rdoc
+        - bundle install --jobs $(nproc)  "${FLAGS[@]}"
+      HEREDOC
+    end
+
+    let(:content) do
+      <<~HEREDOC
+      include:
+        - #{remote_file_path}
+
+      rubocop:
+        script:
+          - bundle exec rubocop
+      HEREDOC
+    end
+
+    context 'with a valid gitlab-ci.yml' do
+      before do
+        WebMock.stub_request(:get, remote_file_path).to_return(body: remote_file_content)
+        project.add_developer(user)
+
+        post :create, namespace_id: project.namespace, project_id: project, content: content
+      end
+
+      it 'should be success' do
+        expect(response).to be_success
+      end
+
+      it 'render show page' do
+        expect(response).to render_template :show
+      end
+
+      it 'should retrieve project' do
+        expect(assigns(:project)).to eq(project)
+      end
+    end
+
+    context 'with an invalid gitlab-ci.yml' do
+      let(:content) do
+        <<~HEREDOC
+        rubocop:
+          scriptt:
+            - bundle exec rubocop
+        HEREDOC
+      end
+
+      before do
+        project.add_developer(user)
+
+        post :create, namespace_id: project.namespace, project_id: project, content: content
+      end
+
+      it 'should assign errors' do
+        expect(assigns[:error]).to eq('jobs:rubocop config contains unknown keys: scriptt')
+      end
+    end
+
+    context 'without enough privileges' do
+      before do
+        project.add_guest(user)
+
+        post :create, namespace_id: project.namespace, project_id: project, content: content
+      end
+
+      it 'should respond with 404' do
+        expect(response).to have_gitlab_http_status(404)
+      end
+    end
+  end
+end
diff --git a/spec/features/ci_lint_spec.rb b/spec/features/projects/ci/lint_spec.rb
similarity index 91%
rename from spec/features/ci_lint_spec.rb
rename to spec/features/projects/ci/lint_spec.rb
index 220b934154e3c0b9d041f5b893700e607e440327..313950072e77e3cd4d75a777bae71cabfa39033b 100644
--- a/spec/features/ci_lint_spec.rb
+++ b/spec/features/projects/ci/lint_spec.rb
@@ -1,10 +1,14 @@
 require 'spec_helper'
 
 describe 'CI Lint', :js do
+  let(:project) { create(:project, :repository) }
+  let(:user) { create(:user) }
+
   before do
-    sign_in(create(:user))
+    project.add_developer(user)
+    sign_in(user)
 
-    visit ci_lint_path
+    visit project_ci_lint_path(project)
     find('#ci-editor')
     execute_script("ace.edit('ci-editor').setValue(#{yaml_content.to_json});")
 
diff --git a/spec/views/ci/lints/show.html.haml_spec.rb b/spec/views/projects/ci/lints/show.html.haml_spec.rb
similarity index 83%
rename from spec/views/ci/lints/show.html.haml_spec.rb
rename to spec/views/projects/ci/lints/show.html.haml_spec.rb
index ded320793ea7d63cebdf01ce16ab900328c33eaf..2f0cd38c14a55086fa5ee918724d0029ae53a894 100644
--- a/spec/views/ci/lints/show.html.haml_spec.rb
+++ b/spec/views/projects/ci/lints/show.html.haml_spec.rb
@@ -1,12 +1,13 @@
 require 'spec_helper'
 
-describe 'ci/lints/show' do
+describe 'projects/ci/lints/show' do
   include Devise::Test::ControllerHelpers
+  let(:project) { create(:project, :repository) }
+  let(:config_processor) { Gitlab::Ci::YamlProcessor.new(YAML.dump(content)) }
 
   describe 'XSS protection' do
-    let(:config_processor) { Gitlab::Ci::YamlProcessor.new(YAML.dump(content)) }
-
     before do
+      assign(:project, project)
       assign(:status, true)
       assign(:builds, config_processor.builds)
       assign(:stages, config_processor.stages)
@@ -48,22 +49,21 @@ describe 'ci/lints/show' do
     end
   end
 
-  let(:content) do
-    {
-      build_template: {
-        script: './build.sh',
-        tags: ['dotnet'],
-        only: ['test@dude/repo'],
-        except: ['deploy'],
-        environment: 'testing'
+  context 'when the content is valid' do
+    let(:content) do
+      {
+        build_template: {
+          script: './build.sh',
+          tags: ['dotnet'],
+          only: ['test@dude/repo'],
+          except: ['deploy'],
+          environment: 'testing'
+        }
       }
-    }
-  end
-
-  let(:config_processor) { Gitlab::Ci::YamlProcessor.new(YAML.dump(content)) }
+    end
 
-  context 'when the content is valid' do
     before do
+      assign(:project, project)
       assign(:status, true)
       assign(:builds, config_processor.builds)
       assign(:stages, config_processor.stages)
@@ -83,6 +83,7 @@ describe 'ci/lints/show' do
 
   context 'when the content is invalid' do
     before do
+      assign(:project, project)
       assign(:status, false)
       assign(:error, 'Undefined error')
     end