Sig is a given name. Notable people with the given name include:
- Sig Andrusking (1913–1994), American football player
- Sig Arno (1895–1975), German-Jewish film actor
- Sig Broskie (1911–1975), American baseball player
- Sig Gissler, American professor
- Sig Grava (1934–2009), American scholar
- Sig Gryska (1914–1994), American baseball player
- Sig Hansen (born 1966), American captain of the fishing vessel Northwestern on the TV series Deadliest Catch
- Sig Haugdahl (1891–1970), Norwegian racing driver
- Sig Herzig (1897–1985), American screenwriter
- Sig Jakucki (1909–1979), American baseball player
- Sig Libowitz (born 1968), American lawyer
- Sig Mejdal (born 1965), American baseball statisticians
- Sig Rogich (born 1944), Icelandic-American businessman
- Sig Ruman (1884–1967), German-American actor
- Sig Shore (1919–2006), American film director
- Fictional characters
- Sig, a character from the Jak & Daxter video game series
- Sig, a character from the Puyo Puyo video game series