Security guard, who protects property, assets, or people

Bodyguard, who protects an individual from personal assault

Guard (grappling), a Judo and Brazilian Jiu-jitsu position

Coast guard, responsible for services at sea

Guard dog, employed to watch for unwanted or unexpected animals or people

Guard (computing), a programming language expression that directs program execution

Crossing guard, who stops traffic so pedestrians can cross the street

Shooting guard, a basketball position

Point guard, a basketball position

Prison guard, who supervises prisoners in a prison or jail

Guard (American football), a player between the center and the tackles on the offensive line of a team

Russian Guards of Russia and the Soviet Union

Guard interval, intervals in transmission, used in telecommunications

Aircraft emergency frequency, a radio band reserved for aircraft in distress

Border guard, a state security agency

Safety barrier, to prevent access to a dangerous area

A defensive position in historical fencing