Jack Baker (1890 – 1947) was an Australian rugby league footballer who played in the 1910s and 1920s.
Baker made his first grade debut for South Sydney against Annandale in Round 2 1919 which finished in an 8–8 draw at Wentworth Park.
Baker spent two years at Souths before signing with North Sydney.
Baker was a member of Norths only premiership victories in 1921 and 1922.
He played in the 1922 grand final against Glebe where Norths won 35–3 at The Sydney Cricket Ground.