下议院警卫官，又称下议院侍卫长，是英国下议院负责维护议院秩序与内部管理事务的官员。这一职位人选经下议院推荐由女王任命。下院警卫官也含有一定的礼仪性作用，特别是在下议院每日开始日常议事时，由他手持权杖引导议长就座。

A serjeant-at-arms (serjeant at arms) or sergeant-at-arms (sergeant at arms) is an officer appointed by a deliberative body, usually a legislature, to keep order during its meetings. The word "sergeant" is derived from the Latin serviens, which means "servant". Serjeant-at-arms (serjeant at arms) is the British spelling.