Horace Stanley Callaghan (25 December 1916 – 9 January 1989) was an Australian rugby league footballer who played in the 1930s and 1940s.
He played for Eastern Suburbs in the NSWRL competition during their second golden era where the club won 4 premierships in 6 seasons.
Callaghan made his first grade debut for Eastern Suburbs against University in Round 5 1937 at the Sydney Cricket Ground scoring a try in a 52–5 victory.
Callaghan went on to win a premiership in his first season at the club as they finished first on the table but were not required to play in a grand final to be declared premiers.
Eastern Suburbs would get their revenge in the final winning 24–14 at the Sydney Cricket Ground in front of 24,167 spectators to claim their 8th premiership.