Hamner is a surname. Notable people with the surname include:
Cully Hamner (born 1969), American comic book artist
Earl Hamner, Jr. (1923-2016), 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