John Connelly may refer to:
- John Connelly (footballer) (1938–2012), English football player
- John E. Connelly (1926–2009), Pittsburgh casino and riverboat owner
- John Connelly (musician) (born 1962), front man and guitarist with band Nuclear Assault
- John R. Connelly (1870–1940), U.S. Representative from Kansas
- John Connelly (historian), American historian
- John Connelly (prospector) (1860–1928), Australian prospector and mine owner