{{Contentious topics}} is a family of templates used as part of the contentious topics system. Contentious topics are specially designated topics that have attracted more persistent disruptive editing than the rest of the project. Administrators are allowed to impose editing restrictions on editors who do not follow project expectations within contentious topics. Administrators are also allowed to set special rules on pages within a contentious topic to prevent inappropriate editing. There are several main templates in this system:

Alerting users

• {{subst:ct/welcome}} ({{Contentious topics/welcome}}) is used, on a user's talk page, to welcome an editor and introduce them to the contentious topics system.
• {{subst:alert}} ({{Contentious topics/alert}}) is used, on a user's talk page, to "alert", or draw a user's attention, to the fact that a specific topic is a contentious topic.

Editnotices

• {{Contentious topics/editnotice}} is used to inform editors that a page is covered by the contentious topics system using an editnotice. Use the one below if the page has restrictions placed on the page.
• {{Contentious topics/page restriction editnotice}} is used to inform editors that the page they are editing is subject to contentious topics restrictions using an editnotice. Use the above if there are no restrictions placed on the page.

Talk page notices

• {{Contentious topics/talk notice}} is used to provide additional communication, using a talk page messagebox (tmbox), to editors that they are editing a page that is covered by the contentious topics system. The template standardises the format and wording of such notices.
• If a user who has been alerted goes on to disruptively edit the affected topic area, they can be reported to the arbitration enforcement (AE) noticeboard, where an administrator will investigate their conduct and issue a sanction if appropriate. {{AE sanction}} is used by administrators to inform a user that they have been sanctioned.

Miscellaneous

• {{Contentious topics/list}} and {{Contentious topics/table}} show which topics are currently designated as contentious topics. They are used by a number of templates and pages on Wikipedia.