Hamner may refer to:
- Nicholas Hamner Cobbs (1796–1861), Bishop of the Episcopal Church in the United States of America
- USS Hamner (DD-718), a Gearing-class destroyer
People with the surname Hamner:
- Cully Hamner (born 1969), American comic book artist
- Earl Hamner, Jr. (born 1923), American television writer and producer
- Granny Hamner (1927–1993), American shortstop and second baseman in Major League Baseball
- Henry K. Hamner (1922–1945), United States Navy officer
- Scott Hamner (21st century), American television writer