Sincock is a surname. Notable people with the surname include:
Andrew Sincock OAM (born 1951), former first-class cricketer Bert Sincock (1887–1946), left-handed pitcher in Major League Baseball David Sincock (born 1942), former Australian cricketer Harrold Sincock (1907–1982), Australian cricketer Peter Sincock (born 1948), Australian cricketer Russell Sincock (born 1947), Australian former cricketer