diff --git a/app/controllers/members_controller.rb b/app/controllers/members_controller.rb
index 297c0c07cf..f5426e9508 100644
--- a/app/controllers/members_controller.rb
+++ b/app/controllers/members_controller.rb
@@ -27,17 +27,24 @@ class MembersController < ApplicationController
 
   require_sudo_mode :create, :update, :destroy
 
+  include MembersHelper
+
   def index
     scope = @project.memberships
-    @offset, @limit = api_offset_and_limit
-    @member_count = scope.count
-    @member_pages = Paginator.new @member_count, @limit, params['page']
-    @offset ||= @member_pages.offset
-    @members = scope.includes(:principal, :roles).order(:id).limit(@limit).offset(@offset).to_a
+    @members = scope.includes(:principal, :roles).order(:id)
 
     respond_to do |format|
       format.html {head 406}
-      format.api
+      format.api do
+        @offset, @limit = api_offset_and_limit
+        @member_count = scope.count
+        @member_pages = Paginator.new @member_count, @limit, params['page']
+        @offset ||= @member_pages.offset
+        @members = @members.limit(@limit).offset(@offset).to_a
+      end
+      format.csv do
+        send_data(members_to_csv(@members), type: 'text/csv; header=present', filename: "#{@project.identifier}-members.csv")
+      end
     end
   end
 
diff --git a/app/helpers/members_helper.rb b/app/helpers/members_helper.rb
index ed1f9ae4c2..1b7c3b1281 100644
--- a/app/helpers/members_helper.rb
+++ b/app/helpers/members_helper.rb
@@ -62,4 +62,23 @@ module MembersHelper
       content_tag('em', content.join(", "), :class => "info")
     end
   end
+
+  def members_to_csv(members)
+    Redmine::Export::CSV.generate(encoding: params[:encoding]) do |csv|
+      # csv headers
+      csv << ['', l(:label_role), l(:field_principal), l(:label_project)]
+
+      # csv lines
+      members.each do |member|
+        member.roles.each do |role|
+          csv << [
+            member.principal.name,
+            role.name,
+            member.principal.is_a?(Group) ? l(:label_group) : l(:label_user),
+            member.project.name
+          ]
+        end
+      end
+    end
+  end
 end
diff --git a/app/views/projects/settings/_members.html.erb b/app/views/projects/settings/_members.html.erb
index 811b0051c5..db09d00d62 100644
--- a/app/views/projects/settings/_members.html.erb
+++ b/app/views/projects/settings/_members.html.erb
@@ -38,6 +38,19 @@
 <% end %>
   </tbody>
 </table>
+<% other_formats_links do |f| %>
+  <%= f.link_to_with_query_parameters "CSV", {}, :onclick => "showModal('csv-export-options', '330px'); return false;" %>
+<% end %>
+<div id="csv-export-options" style="display: none;">
+  <h3 class="title"><%= l(:label_export_options, :export_format => 'CSV') %></h3>
+  <%= form_tag(project_memberships_path(project_id: @project.id, format: 'csv'), :method => :get, :id => 'csv-export-form') do %>
+  <%= export_csv_encoding_select_tag %>
+  <p class="buttons">
+    <%= submit_tag l(:button_export), :name => nil, :onclick => 'hideModal(this);', :data => {:disable_with => false} %>
+    <%= link_to_function l(:button_cancel), 'hideModal(this);' %>
+  </p>
+  <% end %>
+</div>
 <% else %>
 <p class="nodata"><%= l(:label_no_data) %></p>
 <% end %>
diff --git a/test/functional/members_controller_test.rb b/test/functional/members_controller_test.rb
index a23cd74729..72d0e6dd28 100644
--- a/test/functional/members_controller_test.rb
+++ b/test/functional/members_controller_test.rb
@@ -27,6 +27,37 @@ class MembersControllerTest < Redmine::ControllerTest
     @request.session[:user_id] = 2
   end
 
+  def test_index_with_csv_format_should_export_csv
+    project = Project.find(5)
+    get(
+      :index,
+      params: {
+        project_id: project.id,
+        format: 'csv'
+      }
+    )
+    assert_response :success
+    assert_equal 'text/csv; header=present', response.media_type
+
+    lines = response.body.chomp.split("\n")
+    # Number of lines
+    assert_equal project.memberships.sum{|m| m.roles.count } + 1, lines.size
+    # Header
+    assert_equal "\"\",Role,User or Group,Project", lines.first
+    # Details
+    to_test = [
+      'John Smith,Manager,User,Private child of eCookbook',
+      'A Team,Manager,Group,Private child of eCookbook',
+      'A Team,Developer,Group,Private child of eCookbook',
+      'User Misc,Manager,User,Private child of eCookbook',
+      'User Misc,Developer,User,Private child of eCookbook',
+      'Redmine Admin,Manager,User,Private child of eCookbook'
+    ]
+    to_test.each do |expected|
+      assert_includes lines, expected
+    end
+  end
+
   def test_new
     get(:new, :params => {:project_id => 1})
     assert_response :success