The term crew chief can refer to several different things:
- In auto racing, a crew chief is the head person on a pit stop. The crew chief's primary duties include developing car setups, configuring pit strategies, and receiving feedback from his driver about the car's handling. The crew chief has been compared to the head coach in other professional sports.
- In baseball, a crew chief is usually the most experienced or senior umpire of the umpiring staff in a game.
- In the military, crew chiefs are crew members of various vehicles like tanks or aircraft. They are also lovingly called "Crew Dogs","Booger Hookers, "Knuckle Grinders", or simply "Chief".
- In German EMS, the Crew Chief is the person in charge of an ambulance crew. Depending on the level of training of the crew and the role of the ambulance, that person is sometimes a physician.
- In the Air Force, Army, and US Marine Corps, crew chiefs organize and perform pre-flight, post-flight and through-flight inspections, as well as launch and recover aircraft. They are responsible for the lives of the crew members who fly in or drive the aircraft or vehicles. They normally are exposed to the elements and work very long hours. Civilian Crew Chiefs make twice as much as their military counter parts.