警卫室是一个以保安为目的建造的建筑，驻扎有哨兵或警卫。一些警卫室还有监狱之用。

21世纪的警卫室用于各种机关及门禁社区门口，以检查进出入人物，一些大些的机构，警卫室会负责整个地区安全。

美国陆海军警卫室常用的一个口号是“向下一个警卫室重复所有命令”（Repeat all calls more distant from the guardhouse than my own）。 当他们休息时，编号第一位的警卫室第一个休息。

A guardhouse (also known as a watch house, guard building, guard booth, guard shack, security booth, security building, or sentry building) is a building used to house personnel and security equipment. Guardhouses have historically been dormitories for sentries or guards, and places where sentries not posted to sentry posts wait "on call", but are more recently manned by a contracted security company. Some guardhouses also function as jails.