停止并终止（英语：cease and desist）是指一条禁止命令或要求，要求终止一项行为（cease），并且再也不从事（desist），否则将面临法律诉讼。收到cease-and-desist的，可以是个人或组织。

在美国，此术语用在两种不同的情况下cease-and-desist条令可以由法官或政府当局发布，并有明确的法律意图。相比之下，任何个人都能发出cease-and-desist函，但通常由律师起草。

A cease and desist letter, also known as infringement letter or demand letter, is a document sent to an individual or business to halt purportedly unlawful activity ("cease") and not take it up again later ("desist"). The letter may warn that if the recipient by deadlines set in the letter does not cease and desist specified conduct, or take certain actions, that party may be sued.