Bowser may refer to:
- Bowser (character), the main villain in the Mario series of video games
- Bowser, Jr., Bowser's son
- Bowser (tanker), a generic name for a tanker of various kinds
- A fuel dispenser (in Australian English), a machine at a filling station that is used to pump liquid fuel into vehicles
- Bowser, British Columbia, an unincorporated community on Vancouver Island
- Bowser and Blue, a musical duo from Quebec, Canada who write and perform comedic songs
- A fictional police officer named Bowser from the cartoon C.O.P.S.
- Bowser Manufacturing, a manufacturer of model railroad items
- Boomer and Bowser, one of the two mascots owned by the Indiana Pacers
- Jon Bauman (born 1947), singer formerly of Sha Na Na who goes by the stage name of "Bowzer"
Bowser is the surname of:
- Arda Bowser (1899–1996), professional football player
- Charley Bowser (born c. 1890), American football coach
- John Bowser (1856–1936), Australian politician
- John Bowser (1856–1936), Solicitor and Coroner in South Lincolshire
- John W. Bowser (1892–1956), Canadian who supervised construction of the Empire State Building
- Jonathon Earl Bowser, Canadian artist
- Mary Bowser, American freed slave who worked as a Union spy during the American Civil War
- Muriel Bowser, Democratic politician in Washington, D.C
- Ryan Bowser, music producer
- Sylvanus Bowser (19th-century–1938), American inventor
- William John Bowser (1867–1933), Canadian politician