Trooper may refer to:

• Trooper, Pennsylvania, an unincorporated community in Montgomery County, Pennsylvania.
• Trooper (rank), the equivalent rank to Private in many cavalry units.
• Trooper (band), a Canadian rock band
• Colt Trooper, a firearm produced by Colt's Manufacturing Company
• Greg Trooper, American singer-songwriter
• State Trooper, an officer of a law enforcement agency with a cavalry tradition, such as U.S. state police or rangers
• Super Troopers, a 2001 comedy film.
• A cavalry horse
• A troopship
• Stormtrooper (disambiguation)

Trooper should not be confused with:

• Trouper, a member of a troupe
• Super Trouper (song), a 1980 hit single by Swedish pop music group ABBA
• Super Trouper (album), a 1980 album also by ABBA