Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

bartik_theme_suggestions_form_alter in core/themes/bartik/bartik.theme
Implements hook_theme_suggestions_HOOK_alter() for form templates.
block_theme_suggestions_block in core/modules/block/block.module
Implements hook_theme_suggestions_HOOK().
claro_theme_suggestions_details_alter in core/themes/claro/claro.theme
Implements hook_theme_suggestions_HOOK_alter() for details.
claro_theme_suggestions_form_element_alter in core/themes/claro/claro.theme
Implements hook_theme_suggestions_HOOK_alter() for form_element.
forum_theme_suggestions_forums in core/modules/forum/forum.module
Implements hook_theme_suggestions_HOOK().
layout_builder_theme_suggestions_field_alter in core/modules/layout_builder/layout_builder.module
Implements hook_theme_suggestions_HOOK_alter().
layout_builder_theme_suggestions_test_preprocess_item_list__layouts in core/modules/layout_builder/tests/modules/layout_builder_theme_suggestions_test/layout_builder_theme_suggestions_test.module
Implements hook_preprocess_HOOK() for the list of layouts.
layout_builder_theme_suggestions_test_theme in core/modules/layout_builder/tests/modules/layout_builder_theme_suggestions_test/layout_builder_theme_suggestions_test.module
Implements hook_theme().
media_theme_suggestions_media in core/modules/media/media.module
Implements hook_theme_suggestions_HOOK().
node_theme_suggestions_node in core/modules/node/node.module
Implements hook_theme_suggestions_HOOK().
search_theme_suggestions_search_result in core/modules/search/search.module
Implements hook_theme_suggestions_HOOK().
system_theme_suggestions_field in core/modules/system/system.module
Implements hook_theme_suggestions_HOOK().
system_theme_suggestions_html in core/modules/system/system.module
Implements hook_theme_suggestions_HOOK().
system_theme_suggestions_maintenance_page in core/modules/system/system.module
Implements hook_theme_suggestions_HOOK().
system_theme_suggestions_page in core/modules/system/system.module
Implements hook_theme_suggestions_HOOK().
system_theme_suggestions_region in core/modules/system/system.module
Implements hook_theme_suggestions_HOOK().
taxonomy_theme_suggestions_taxonomy_term in core/modules/taxonomy/taxonomy.module
Implements hook_theme_suggestions_HOOK().
test_legacy_theme_theme_suggestions_theme_test_function_suggestions_alter in core/modules/system/tests/themes/test_legacy_theme/test_legacy_theme.theme
Implements hook_theme_suggestions_HOOK_alter().
test_theme_theme_suggestions_alter in core/modules/system/tests/themes/test_theme/test_theme.theme
Implements hook_theme_suggestions_alter().
test_theme_theme_suggestions_theme_test_suggestions_alter in core/modules/system/tests/themes/test_theme/test_theme.theme
Implements hook_theme_suggestions_HOOK_alter().
theme_legacy_suggestions_test_theme_suggestions_theme_test_function_suggestions_alter in core/modules/system/tests/modules/theme_legacy_suggestions_test/theme_legacy_suggestions_test.module
Implements hook_theme_suggestions_HOOK_alter().
theme_legacy_suggestions_test_theme_suggestions_theme_test_suggestions_include_alter in core/modules/system/tests/modules/theme_legacy_suggestions_test/theme_legacy_suggestions_test.module
Implements hook_theme_suggestions_HOOK_alter().
theme_legacy_test_theme_suggestions_alter in core/modules/system/tests/modules/theme_legacy_test/theme_legacy_test.module
Implements hook_theme_suggestions_alter().
theme_legacy_test_theme_suggestions_theme_test_suggestions_alter in core/modules/system/tests/modules/theme_legacy_test/theme_legacy_test.module
Implements hook_theme_suggestions_HOOK_alter().
theme_legacy_test_theme_suggestions_theme_test_suggestion_provided in core/modules/system/tests/modules/theme_legacy_test/theme_legacy_test.module
Implements hook_theme_suggestions_HOOK().
theme_suggestions_test_theme_suggestions_alter in core/modules/system/tests/modules/theme_suggestions_test/theme_suggestions_test.module
Implements hook_theme_suggestions_alter().
theme_suggestions_test_theme_suggestions_theme_test_specific_suggestions_alter in core/modules/system/tests/modules/theme_suggestions_test/theme_suggestions_test.module
Implements hook_theme_suggestions_HOOK_alter().
theme_suggestions_test_theme_suggestions_theme_test_suggestions_alter in core/modules/system/tests/modules/theme_suggestions_test/theme_suggestions_test.module
Implements hook_theme_suggestions_HOOK_alter().
theme_test_theme_suggestions_alter in core/modules/system/tests/modules/theme_test/theme_test.module
Implements hook_theme_suggestions_alter().
theme_test_theme_suggestions_node in core/modules/system/tests/modules/theme_test/theme_test.module
Implements hook_theme_suggestions_HOOK().
theme_test_theme_suggestions_theme_test_preprocess_suggestions in core/modules/system/tests/modules/theme_test/theme_test.module
Implements hook_theme_suggestions_HOOK().
theme_test_theme_suggestions_theme_test_suggestions_alter in core/modules/system/tests/modules/theme_test/theme_test.module
Implements hook_theme_suggestions_HOOK_alter().
theme_test_theme_suggestions_theme_test_suggestion_provided in core/modules/system/tests/modules/theme_test/theme_test.module
Implements hook_theme_suggestions_HOOK().
theme_theme_suggestions_test_include in core/modules/system/tests/modules/theme_legacy_suggestions_test/theme_legacy_suggestions_test.inc
Returns HTML for a theme function include test.
umami_theme_suggestions_block_alter in core/profiles/demo_umami/themes/umami/umami.theme
Implements hook_theme_suggestions_HOOK_alter() for block templates.
views_theme_suggestions_comment_alter in core/modules/views/views.module
Implements hook_theme_suggestions_HOOK_alter().
views_theme_suggestions_container_alter in core/modules/views/views.module
Implements hook_theme_suggestions_HOOK_alter().
views_theme_suggestions_node_alter in core/modules/views/views.module
Implements hook_theme_suggestions_HOOK_alter().
views_ui_theme_suggestions_views_ui_view_preview_section in core/modules/views_ui/views_ui.module
Implements hook_theme_suggestions_HOOK().