A trapper is a person who engages in animal trapping.

Trapper may also refer to:

• Trapper Lake (disambiguation), several lakes
• Trapper Mountain, Washington, United States
• Trapper Peak (Canada), a mountain in the Waputik Range, on the border between Alberta and British Columbia
• Trapper Peak (Montana), United States, a mountain in the Selway-Bitterroot Wilderness Area

• Trapper (Dungeons & Dragons), monster type found in some fantasy role-playing games
• Trapper John McIntyre, a character in the M*A*S*H franchise

• Trapper (ice hockey), goaltending equipment
• Tilburg Trappers, a Dutch hockey team
• Edmonton Trappers, a Canadian former minor league baseball team
• Fitchburg Trappers, a defunct American minor league ice hockey team
• Salt Lake City Trappers, a short-lived American former minor league baseball team
• Trapper, the mascot for Fort Vancouver High School, Vancouver, Washington

• Chris Trapper (born 1971), American songwriter
• Trapper Nelson (1909–1968), American trapper, hunter and founder of a zoo in Florida
• Trapper Schoepp, American singer-songwriter
• Coal trapper, a person who operates a trap door in a coal mine
• Trapper hat, a fur hat similar to an ushanka
• Trapper, a slang term for a person who partakes in the illegal drug trade
• Trapper, a pattern of pocketknife
• Trapper, file folder storable in a Trapper Keeper

• Albert Johnson (criminal) (died 1932), Canadian fugitive nicknamed the "Mad Trapper"