A serjeant-at-arms or sergeant-at-arms is an officer appointed by a deliberative body, usually a legislature, to keep order during its meetings. The word "serjeant" is derived from the Latin serviens, which means "servant". Historically, serjeants-at-arms were armed men retained by English lords and monarchs, and the ceremonial maces which they are associated with were originally a type of weapon.

A ceremonial mace is a highly ornamented staff of metal or wood, carried before a sovereign or other high officials in civic ceremonies by a mace-bearer, intended to represent the official's authority. The mace, as used today, derives from the original mace used as a weapon. Processions often feature maces, as on parliamentary or formal academic occasions.