Rettig is a surname. Notable people with the surname include:
Chase Rettig (born 1991), American football quarterback for Boston College
Haviv Rettig, Israeli-American journalist
Lorna Rettig, English curler, participated in the 2010 European Curling Championships – Women's tournament
Otto Rettig (1894-1977), American baseball pitcher
Raúl Rettig (1909-2000), Chilean politician and lawyer
Tommy Rettig (1941-1996), American child actor and computer software engineer and author
Fictional characters:
Lancer Rettig, fictional character in the novel Endymion by Dan Simmons