Jack Kadwell (1918−2008) was an Australian professional rugby league footballer who played in the 1930s and 1940s for South Sydney and Newtown as a halfback and occasionally as a five-eighth.
Kadwell was a St George junior but made his first grade debut for South Sydney in Round 14 of the 1938 season.
In 1939, Kadwell played at five-eighth for Souths in the heavy grand final defeat byBalmain 33–4.
In 1941, Kadwell joined Newtown but missed out on the 1943 grand final victory over North Sydney due to injury.
Newtown lost the match 19-16 but as they finished first on the table at the end of the regular season, they were allowed to challenge for a rematch.