diff --git a/app/helpers/icons_helper.rb b/app/helpers/icons_helper.rb
index 0dc341941..9a2ae2d98 100644
--- a/app/helpers/icons_helper.rb
+++ b/app/helpers/icons_helper.rb
@@ -18,11 +18,23 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 module IconsHelper
+  include Redmine::Themes::Helper
+
   DEFAULT_ICON_SIZE = "18"
   DEFAULT_SPRITE = "icons"
 
+  def sprite_source(icon_name, sprite: DEFAULT_SPRITE, plugin: nil)
+    if plugin
+      "plugin_assets/#{plugin}/#{sprite}.svg"
+    elsif current_theme && current_theme.icons(sprite).include?(icon_name)
+      current_theme.image_path("#{sprite}.svg")
+    else
+      "#{sprite}.svg"
+    end
+  end
+
   def sprite_icon(icon_name, label = nil, icon_only: false, size: DEFAULT_ICON_SIZE, style: :outline, css_class: nil, sprite: DEFAULT_SPRITE, plugin: nil, rtl: false)
-    sprite = plugin ? "plugin_assets/#{plugin}/#{sprite}.svg" : "#{sprite}.svg"
+    sprite = sprite_source(icon_name, sprite: sprite, plugin: plugin)
 
     svg_icon = svg_sprite_icon(icon_name, size: size, style: style, css_class: css_class, sprite: sprite, rtl: rtl)
 
diff --git a/lib/redmine/themes.rb b/lib/redmine/themes.rb
index 80e846550..601b8abd3 100644
--- a/lib/redmine/themes.rb
+++ b/lib/redmine/themes.rb
@@ -110,6 +110,17 @@ module Redmine
         "themes/#{dir}/"
       end
 
+      # Returns an array of icon names available in the given sprite
+      def icons(sprite)
+        asset = Rails.application.assets.load_path.find(image_path("#{sprite}.svg"))
+
+        return [] unless asset
+
+        ActionController::Base.cache_store.fetch("theme-icons/#{id}/#{sprite}/#{asset.digest}") do
+          asset.content.scan(/id=['"]icon--([^'"]+)['"]/).flatten
+        end
+      end
+
       def asset_paths
         base_dir = Pathname.new(path)
         paths = base_dir.children.select do |child|
diff --git a/test/helpers/icons_helper_test.rb b/test/helpers/icons_helper_test.rb
index 527e8fc03..061e5bede 100644
--- a/test/helpers/icons_helper_test.rb
+++ b/test/helpers/icons_helper_test.rb
@@ -43,6 +43,93 @@ class IconsHelperTest < Redmine::HelperTest
     assert_match expected, icon
   end
 
+  def test_sprite_source_without_theme_should_return_default_sprite
+    stubs(:current_theme).returns(nil)
+
+    assert_equal "icons.svg", sprite_source('edit')
+  end
+
+  def test_sprite_source_with_theme_and_sprite_image_should_return_theme_path_if_icon_exists
+    theme = Redmine::Themes::Theme.new('/tmp/test')
+    theme.stubs(:id).returns('test')
+    theme.stubs(:image_path).with('icons.svg').returns('themes/test/icons.svg')
+
+    asset = mock('asset')
+    asset.stubs(:digest).returns('123456')
+    asset.stubs(:content).returns('<symbol id="icon--edit"></symbol>')
+    asset.stubs(:digested_path).returns('themes/test/icons-123456.svg')
+
+    Rails.application.assets.load_path.stubs(:find).with('themes/test/icons.svg').returns(asset)
+    stubs(:current_theme).returns(theme)
+
+    assert_equal "themes/test/icons.svg", sprite_source('edit')
+  end
+
+  def test_sprite_source_with_theme_without_sprite_image_should_return_default_sprite
+    theme = Redmine::Themes::Theme.new('/tmp/test')
+    theme.stubs(:image_path).with('icons.svg').returns('themes/test/icons.svg')
+
+    Rails.application.assets.load_path.stubs(:find).with('themes/test/icons.svg').returns(nil)
+    stubs(:current_theme).returns(theme)
+
+    assert_equal "icons.svg", sprite_source('edit')
+  end
+
+  def test_sprite_source_with_theme_and_sprite_image_but_missing_icon_should_fallback_to_default_sprite
+    theme = Redmine::Themes::Theme.new('/tmp/test')
+    theme.stubs(:id).returns('test')
+    theme.stubs(:image_path).with('icons.svg').returns('themes/test/icons.svg')
+
+    asset = mock('asset')
+    asset.stubs(:digest).returns('123456')
+    asset.stubs(:content).returns('<symbol id="icon--other"></symbol>')
+    asset.stubs(:digested_path).returns('themes/test/icons-123456.svg')
+
+    Rails.application.assets.load_path.stubs(:find).with('themes/test/icons.svg').returns(asset)
+    stubs(:current_theme).returns(theme)
+
+    assert_equal "icons.svg", sprite_source('edit')
+  end
+
+  def test_sprite_icon_with_theme_override_should_use_theme_sprite
+    theme = Redmine::Themes::Theme.new('/tmp/test')
+    theme.stubs(:id).returns('test')
+    theme.stubs(:image_path).with('icons.svg').returns('themes/test/icons.svg')
+
+    asset = mock('asset')
+    asset.stubs(:digest).returns('123456')
+    asset.stubs(:content).returns('<symbol id="icon--edit"></symbol>')
+    asset.stubs(:digested_path).returns('themes/test/icons-123456.svg')
+
+    Rails.application.assets.load_path.stubs(:find).with('themes/test/icons.svg').returns(asset)
+    stubs(:current_theme).returns(theme)
+
+    expected = %r{<svg class="s18 icon-svg" aria-hidden="true"><use href="/assets/themes/test/icons(-123456)?\.svg#icon--edit"></use></svg>$}
+    assert_match expected, sprite_icon('edit')
+  end
+
+  def test_sprite_icon_with_theme_missing_icon_should_fallback_to_default_sprite
+    theme = Redmine::Themes::Theme.new('/tmp/test')
+    theme.stubs(:id).returns('test')
+    theme.stubs(:image_path).with('icons.svg').returns('themes/test/icons.svg')
+
+    asset = mock('asset')
+    asset.stubs(:digest).returns('123456')
+    asset.stubs(:content).returns('<symbol id="icon--other"></symbol>')
+    asset.stubs(:digested_path).returns('themes/test/icons-123456.svg')
+
+    Rails.application.assets.load_path.stubs(:find).with('themes/test/icons.svg').returns(asset)
+
+    default_asset = mock('asset')
+    default_asset.stubs(:digested_path).returns('icons-default.svg')
+    Rails.application.assets.load_path.stubs(:find).with('icons.svg').returns(default_asset)
+
+    stubs(:current_theme).returns(theme)
+
+    expected = %r{<svg class="s18 icon-svg" aria-hidden="true"><use href="/assets/icons(-\w+)?\.svg#icon--edit"></use></svg>$}
+    assert_match expected, sprite_icon('edit')
+  end
+
   def test_sprite_icon_should_return_svg_with_custom_size
     expected = %r{<svg class="s24 icon-svg" aria-hidden="true"><use href="/assets/icons-\w+.svg#icon--edit"></use></svg>$}
     icon = sprite_icon('edit', size: '24')
diff --git a/test/unit/lib/redmine/themes_test.rb b/test/unit/lib/redmine/themes_test.rb
index 139dded65..f24df6ea4 100644
--- a/test/unit/lib/redmine/themes_test.rb
+++ b/test/unit/lib/redmine/themes_test.rb
@@ -59,4 +59,54 @@ class Redmine::ThemesTest < ActiveSupport::TestCase
   ensure
     Redmine::Themes.rescan
   end
+
+  def test_icons_should_return_available_icons
+    theme = Redmine::Themes::Theme.new('/tmp/test')
+    theme.stubs(:image_path).with('icons.svg').returns('themes/test/icons.svg')
+
+    asset = mock('asset')
+    asset.stubs(:content).returns('<svg><symbol id="icon--edit"></symbol><symbol id=\'icon--delete\'></symbol></svg>')
+    asset.stubs(:digest).returns('123456')
+
+    Rails.application.assets.load_path.stubs(:find).with('themes/test/icons.svg').returns(asset)
+
+    assert_equal ['edit', 'delete'], theme.icons('icons')
+  end
+
+  def test_icons_should_return_empty_array_if_asset_missing
+    theme = Redmine::Themes::Theme.new('/tmp/test')
+    theme.stubs(:image_path).with('icons.svg').returns('themes/test/icons.svg')
+
+    Rails.application.assets.load_path.stubs(:find).with('themes/test/icons.svg').returns(nil)
+
+    assert_equal [], theme.icons('icons')
+  end
+
+  def test_icons_should_be_cached
+    theme = Redmine::Themes::Theme.new('/tmp/test')
+    theme.stubs(:id).returns('test')
+    theme.stubs(:image_path).with('icons.svg').returns('themes/test/icons.svg')
+
+    asset = mock('asset')
+    asset.stubs(:content).returns('<symbol id="icon--edit"></symbol>')
+    asset.stubs(:digest).returns('123456')
+
+    Rails.application.assets.load_path.stubs(:find).with('themes/test/icons.svg').returns(asset)
+
+    # Use a memory store for this test since the test environment uses null_store
+    memory_store = ActiveSupport::Cache.lookup_store(:memory_store)
+    ActionController::Base.stubs(:cache_store).returns(memory_store)
+
+    # First call - cache miss
+    assert_equal ['edit'], theme.icons('icons')
+
+    # Second call - verify it's in the cache
+    cache_key = "theme-icons/test/icons/123456"
+    assert_equal ['edit'], memory_store.read(cache_key)
+
+    # If digest changes, it should miss cache
+    asset.stubs(:digest).returns('789')
+    asset.stubs(:content).returns('<symbol id="icon--new"></symbol>')
+    assert_equal ['new'], theme.icons('icons')
+  end
 end