John Connelly may refer to:

• John Connelly (baseball) (died 2013), American college baseball coach
• John Connelly (1910s footballer), English footballer
• John Connelly (footballer, born 1938) (1938–2012), English footballer
• John Connelly (historian), American historian
• John Connelly (musician) (born 1962), front man and guitarist with band Nuclear Assault
• John Connelly (prospector) (1860–1928), Australian prospector and mine owner
• John E. Connelly (1925–2009), Pittsburgh casino and riverboat owner
• John R. Connelly (1870–1940), U.S. Representative from Kansas

• John Connally (1917–1993), American politician
• John Connolly (disambiguation)
• John Conolly (disambiguation)