Note: this list is generated by looking for the string for this theme hook, so it may include some references that are not actually using this theme hook.

ajax_example_add_more in modules/examples/ajax_example/ajax_example_graceful_degradation.inc
Form with 'add more' and 'remove' buttons.
ajax_example_advanced_commands in modules/examples/ajax_example/ajax_example_advanced.inc
Form to display the AJAX Commands.
ajax_example_autocheckboxes in modules/examples/ajax_example/ajax_example.module
Form manipulation through AJAX.
ajax_example_autotextfields in modules/examples/ajax_example/ajax_example.module
Show/hide textfields based on AJAX-enabled checkbox clicks.
ajax_example_dependent_dropdown_degrades in modules/examples/ajax_example/ajax_example_graceful_degradation.inc
Dropdown form based on previous choices.
ajax_example_dynamic_sections in modules/examples/ajax_example/ajax_example_graceful_degradation.inc
Dynamically-enabled form with graceful no-JS degradation.
ajax_example_wizard in modules/examples/ajax_example/ajax_example_graceful_degradation.inc
Wizard form.
backdrop_common_theme in core/includes/common.inc
Provides theme registration for themes across .inc files.
Block::getAdminConditionsPreview in core/modules/layout/includes/block.class.inc
Return a fieldset listing any visibility conditions set for this block.
cache_example_page_form in modules/examples/cache_example/cache_example.module
Main page for cache_example.
ckeditor_settings_form in core/modules/ckeditor/ckeditor.admin.inc
Editor settings callback; Provide options for CKEditor module.
color_form_system_theme_settings_alter in core/modules/color/color.module
Implements hook_form_FORM_ID_alter().
comment_admin_overview in core/modules/comment/comment.admin.inc
Form constructor for the comment overview administration form.
comment_form in core/modules/comment/comment.module
Form constructor for the basic commenting form.
comment_form_node_form_alter in core/modules/comment/comment.module
Implements hook_form_BASE_FORM_ID_alter().
comment_form_node_type_form_alter in core/modules/comment/comment.module
Implements hook_form_FORM_ID_alter().
CommonBackdropArrayUnitTest::setUp in core/modules/simpletest/tests/common.test
Sets up unit test environment.
CommonBackdropArrayUnitTest::testGet in core/modules/simpletest/tests/common.test
Tests getting nested array values.
CommonBackdropArrayUnitTest::testSet in core/modules/simpletest/tests/common.test
Tests setting nested array values.
CommonBackdropArrayUnitTest::testUnset in core/modules/simpletest/tests/common.test
Tests unsetting nested array values.
CommonBackdropRenderTestCase::testBackdropRenderChildrenAttached in core/modules/simpletest/tests/common.test
Test #attached functionality in children elements.
CommonBackdropRenderTestCase::testBackdropRenderFormElements in core/modules/simpletest/tests/common.test
Test rendering form elements without passing through form_builder().
contact_form_user_admin_settings_alter in core/modules/contact/contact.module
Implements hook_form_FORM_ID_alter().
contact_form_user_profile_form_alter in core/modules/contact/contact.module
Implements hook_form_FORM_ID_alter().
contact_settings_form in core/modules/contact/contact.admin.inc
Contact settings form.
cron_example_form in modules/examples/cron_example/cron_example.module
The form to provide a link to cron.php.
DashboardOverviewContentBlock::form in core/modules/dashboard/includes/block.overview_content.inc
Build the settings form for editing this block.
DatabaseTasks::getFormOptions in core/includes/install.inc
Return driver specific configuration options.
date_form_field_ui_field_edit_form_alter in core/modules/date/date.module
Implements hook_form_FORM_ID_alter() for field_ui_field_edit_form().
date_views_filter_handler_simple::date_parts_form in core/modules/date/views/date_views_filter_handler_simple.inc
A form element to select date part values.
dblog_clear_log_form in core/modules/dblog/dblog.admin.inc
Form constructor for the form that clears out the log.
dblog_filter_form in core/modules/dblog/dblog.admin.inc
Form constructor for the database logging filter form.
dbtng_example_form_add in modules/examples/dbtng_example/dbtng_example.module
Prepare a simple form to add an entry, with all the interesting fields.
FieldBlock::form in core/modules/field/field.block.inc
Builds the block's configuration form.
field_example_field_widget_form in modules/examples/field_example/field_example.module
Implements hook_field_widget_form().
field_test_entity_nested_form in core/modules/field/tests/field_test/field_test.entity.inc
Form combining two separate entities.
field_ui_default_value_widget in core/modules/field_ui/field_ui.admin.inc
Builds the default value fieldset for a given field instance.
field_ui_field_edit_form in core/modules/field_ui/field_ui.admin.inc
Form constructor for the field instance settings form.
field_ui_field_settings_form in core/modules/field_ui/field_ui.admin.inc
Form constructor for the field settings edit page.
field_ui_widget_type_form in core/modules/field_ui/field_ui.admin.inc
Form constructor for the widget selection form.
FileTransfer::getSettingsForm in core/includes/filetransfer/filetransfer.inc
Returns a form to collect connection settings credentials.
file_display_form in core/modules/file/file.admin.inc
Form callback; presents file display settings for a given view mode.
file_example_readwrite in modules/examples/file_example/file_example.module
Form builder function.
file_field_widget_form in core/modules/file/file.field.inc
Implements hook_field_widget_form().
file_manage_form in core/modules/file/file.pages.inc
Page callback: Form constructor for the file manage form.
file_settings_form in core/modules/file/file.admin.inc
Form callback for file settings.
file_type_form in core/modules/file/file.admin.inc
Form constructor for the file type settings form.
filter_admin_format_form in core/modules/filter/filter.admin.inc
Form constructor for the text format add/edit form.
filter_format_editor_link_form in core/modules/filter/filter.pages.inc
Form callback: Display a form for inserting/editing a link or uploading a file.
filter_process_format in core/modules/filter/filter.module
Expands an element into a base element with text format selector attached.
form_example_states_form in modules/examples/form_example/form_example_states.inc
States demo form.
form_example_tutorial_3 in modules/examples/form_example/form_example_tutorial.inc
Example 3: A basic form with fieldsets.
form_example_tutorial_4 in modules/examples/form_example/form_example_tutorial.inc
Example 4: Basic form with required fields.
form_example_tutorial_5 in modules/examples/form_example/form_example_tutorial.inc
Example 5: Basic form with additional element attributes.
form_example_tutorial_6 in modules/examples/form_example/form_example_tutorial.inc
Example 6: A basic form with a validate handler.
form_example_tutorial_7 in modules/examples/form_example/form_example_tutorial.inc
Example 7: With a submit handler.
form_example_tutorial_9 in modules/examples/form_example/form_example_tutorial.inc
Example 9: A form with a dynamically added new fields.
form_process_vertical_tabs in core/includes/form.inc
Creates a group formatted as vertical tabs.
form_test_system_config_form in core/modules/simpletest/tests/form_test.module
A form to test system_settings_form().
hook_search_admin in core/modules/search/search.api.php
Add elements to the search settings form.
installer_browser_installation_theme_form in core/modules/installer/installer.pages.inc
Form builder for theme install.
installer_manager_install_form in core/modules/installer/installer.manager.inc
Form constructor for the install form of the Installer module.
language_negotiation_configure_url_form in core/modules/locale/locale.admin.inc
Builds the URL language provider configuration form.
layout_block_configure_form in core/modules/layout/layout.admin.inc
Form callback; Add or edit a block within a layout.
layout_flexible_template_edit_row_form in core/modules/layout/layout.flexible.inc
Form to add or edit a row on a flexible template.
layout_menu_item_form in core/modules/layout/layout.admin.inc
Form callback; Configure a layout menu item.
link_field_instance_settings_form in core/modules/link/link.module
Implements hook_field_instance_settings_form().
locale_language_selector_form in core/modules/locale/locale.module
Form builder callback to display language selection widget.
locale_translate_import_form in core/modules/locale/locale.bulk.inc
User interface for the translation import screen.
locale_translation_filter_form in core/modules/locale/locale.pages.inc
Return form for locale translation filters.
menu_form_node_form_alter in core/modules/menu/menu.module
Implements hook_form_BASE_FORM_ID_alter().
menu_form_node_type_form_alter in core/modules/menu/menu.module
Implements hook_form_FORM_ID_alter().
nodeapi_example_form_alter in modules/examples/nodeapi_example/nodeapi_example.module
Implements hook_form_alter().
node_access_example_form_alter in modules/examples/node_access_example/node_access_example.module
Implements hook_form_alter().
node_form in core/modules/node/node.pages.inc
Form constructor for the node add/edit form.
node_form_search_form_alter in core/modules/node/node.module
Implements hook_form_FORM_ID_alter().
node_search_admin in core/modules/node/node.module
Implements hook_search_admin().
node_type_form in core/modules/node/node.types.inc
Form constructor for the node type editing form.
PageComponents::form in core/modules/system/block.page_components.inc
Build the settings form for editing this block.
path_admin_filter_form in core/modules/path/path.admin.inc
Form constructor for the path admin overview filter form.
path_bulk_update_form in core/modules/path/path.admin.inc
Form builder; Bulk path alias update form.
path_form_element in core/modules/path/path.module
Return a portion of a form for setting an alias on an entity.
path_patterns_form in core/modules/path/path.admin.inc
Form builder; Configure the URL alias patterns.
path_patterns_settings_form in core/modules/path/path.admin.inc
Form builder; Configure the URL alias pattern settings.
path_pattern_settings_form in core/modules/path/path.module
Return the URL alias pattern settings form for easy addition into other forms.
queue_example_add_remove_form in modules/examples/queue_example/queue_example.module
Form generator for managing the queue.
redirect_field_attach_form in core/modules/redirect/redirect.module
Implements hook_field_attach_form().
redirect_list_404_filter_form in core/modules/redirect/redirect.admin.inc
Return a form to filter URL redirects.
redirect_list_filter_form in core/modules/redirect/redirect.admin.inc
Return a partial form to filter URL redirects.
redirect_list_form in core/modules/redirect/redirect.admin.inc
Form callback; Display the list of all redirects.
search_admin_settings in core/modules/search/search.admin.inc
Menu callback: displays the search module settings page.
search_block_configure in core/modules/search/search.module
Implements hook_block_configure().
simpletest_result_form in core/modules/simpletest/simpletest.pages.inc
Test results form for $test_id.
simpletest_settings_form in core/modules/simpletest/simpletest.pages.inc
Provides settings form for SimpleTest variables.
simpletest_test_form in core/modules/simpletest/simpletest.pages.inc
List tests arranged in groups that can be selected and run.
system_cron_settings in core/modules/system/system.admin.inc
Form builder; Cron form.
system_element_info in core/modules/system/system.module
Implements hook_element_info().
system_header_block_form in core/modules/system/system.module
Settings form for the header block.
system_modules in core/modules/system/system.admin.inc
Menu callback; provides module enable/disable interface.
system_performance_settings in core/modules/system/system.admin.inc
Form builder; Configure site performance settings.
system_regional_settings in core/modules/system/system.admin.inc
Form builder; Configure the site regional settings.
system_site_information_settings in core/modules/system/system.admin.inc
Form builder; The general site information form.
system_themes_admin_form in core/modules/system/system.admin.inc
Form to select the administration theme.
system_user_timezone in core/modules/system/system.module
Add the time zone field to the user edit and register forms.
taxonomy_form_term in core/modules/taxonomy/taxonomy.admin.inc
Form function for the term edit form.
taxonomy_form_vocabulary in core/modules/taxonomy/taxonomy.admin.inc
Form builder for the vocabulary editing form.
theme-settings.php in core/themes/bartik/theme-settings.php
theme-settings.php in core/themes/basis/theme-settings.php
Theme settings file for Basis.
theme_ckeditor_settings_toolbar in core/modules/ckeditor/ckeditor.theme.inc
Displays the toolbar configuration for CKEditor.
theme_date_combo in core/modules/date/date.theme.inc
Returns HTML for a start/end date combination on form.
theme_options in core/modules/field/modules/options/options.theme.inc
Theme an options element.
translation_form_node_form_alter in core/modules/translation/translation.module
Implements hook_form_BASE_FORM_ID_alter() for node_form().
update_script_selection_form in core/update.php
Form constructor for the list of available database module updates.
update_settings in core/modules/update/update.admin.inc
Form constructor for the update settings form.
user_account_form in core/modules/user/user.module
Helper function to add default user account fields to user registration and edit form.
user_admin_roles in core/modules/user/user.admin.inc
Form to re-order roles or add a new one.
user_admin_settings in core/modules/user/user.admin.inc
Form builder; Configure user settings for this site.
user_login_settings in core/modules/user/user.admin.inc
Login settings form.
user_settings_email in core/modules/user/user.admin.inc
Form builder; Configure user email settings for this site.
vertical_tabs_example_form_alter in modules/examples/vertical_tabs_example/vertical_tabs_example.module
Implements hook_form_alter().
ViewsBlock::form in core/modules/views/includes/views.block.inc
Build the settings form for editing this block.
ViewsUiBaseViewsWizard::build_form in core/modules/views_ui/wizards/views_ui_base_views_wizard.php
For AJAX callbacks to build other elements in the "show" form.
views_handler::options_form in core/modules/views/includes/handlers.inc
Build the options form.
views_handler_area_text::options_form in core/modules/views/handlers/views_handler_area_text.inc
Default options form that provides the label widget that all fields should have.
views_handler_argument::options_form in core/modules/views/handlers/views_handler_argument.inc
Build the options form.
views_handler_field::options_form in core/modules/views/handlers/views_handler_field.inc
Default options form that provides the label widget that all fields should have.
views_handler_field_field::multiple_options_form in core/modules/field/views/views_handler_field_field.inc
Provide options for multiple value fields.
views_plugin_pager_full::options_form in core/modules/views/plugins/views_plugin_pager_full.inc
Provide the default form for setting options.
views_plugin_row_rss_fields::options_form in core/modules/views/plugins/views_plugin_row_rss_fields.inc
Provide a form for setting options.
views_ui_add_form in core/modules/views_ui/views_ui.admin.inc
Form builder for the "Add view" page.
views_ui_admin_settings_advanced in core/modules/views_ui/views_ui.admin.inc
Form builder for the advanced admin settings page.
views_ui_admin_settings_basic in core/modules/views_ui/views_ui.admin.inc
Form builder for the admin display defaults page.
_authorize_filetransfer_connection_settings_set_defaults in core/includes/authorize.inc
Sets the default settings on a file transfer connection form recursively.
_book_add_form_elements in core/modules/book/book.module
Builds the common elements of the book form for the node and outline forms.
_form_test_vertical_tabs_form in core/modules/simpletest/tests/form_test.module
Tests functionality of vertical tabs.
_install_configure_form in core/includes/install.core.inc
Form constructor for a site configuration form.