Trooper can refer to:

• Canadian rock band Trooper
• a cavalry soldier of private rank, member of a troop. The rank of trooper (Tpr.) in British and Canadian armoured branches of service.
• the stormtroopers of Nazi Germany.
• Trooper, Pennsylvania
• officers of the Texas Department of Public Safety

Trooper should not be confused with trouper, a member of troupe of actors, in theatre.