Poster is a surname. Notable people with the surname include:
Jem Poster (born 1949), British poet and novelist Kim Poster (born 1957), American-British theatre producer Mark Poster (1941–2012), American academic Meryl Poster, American film producer and businessperson Randall Poster, American music supervisor Ron Poster, Boston Bruins stadium organist Steven Poster (born 1944), American cinematographer and photographer Tim Poster, (born c. 1968), American entrepreneur