被禁制用戶
被禁制用戶是那些被正式地禁止編輯某個維基媒體維基的人。這一決定可能是臨時的或永久的。
不同維基有不同的禁制政策。通常，用戶可能因人身攻擊，濫發廣告，法律威脅，嚴重破壞或其他形式擾亂而被禁制。
禁制有时由封禁执行，而封禁是阻止用户、IP地址或IP地址段编辑页面的措施。注意禁制不等同于封禁：禁制是正式决定或社区大多数成员的共识，并且一般由一种形式的不当行为导致，而管理员可以仅因为破坏行为或其他对规则的违反而执行封禁。
Banned users wishing to rejoin the community should go about the appeal methods usually set down in their ban decree. If such a condition is absent, one can usually take the issue (on a Wikimedia-run Wiki) to one of the mailing lists, Jimbo Wales himself, or possibly IRC.
禁制用戶的貢獻
不同維基有不同關於禁制用戶貢獻的政策。 The English Wikisource has a policy allowing deletion of "content created and edited solely by a banned user after they were banned, where there is possibility of bad faith. Good contributions by a banned user should be accepted, but where bad faith is possible it should be assumed." The English Wikipedia has a policy allowing deletion of pages "created by banned or blocked users in violation of their ban or block, and which have no substantial edits by others. G5 should not be applied to transcluded templates." 維基語錄沒有這類政策, 維基教科書及維基詞典也沒有。