Frank Threlfo (1932–2012) was an Australian rugby league footballer who played in the 1950s.
He won a premiership with Souths, playing on the wing in the victorious 1953 Grand Final team that defeated St George.
Threlfo returned to Maitland, New South Wales the following year and saw out his rugby league career for the local Maitland team.
He was awarded Life Membership of the Newcastle Rugby League, after a lifetime of commitment to Rugby League in Newcastle.
[3] Threlfo died on 10 October 2012, aged 80.