Thomas or Tom O'Halloran may refer to:
Tom O'Halloran (footballer) (1892–1970), Australian rules (VFL) footballer with South Melbourne Tom O'Halloran (climber) (born 1992), Australian climber Tom O'Halloran (musician), Australian musician Thomas O'Halloran (footballer) (1904–1956) Australian rules (VFL) footballer playing for Richmond Thomas A. O'Halloran (1931–2015), American particle physicist Thomas Shuldham O'Halloran (1797–1870), South Australian police commissioner T. J. S. O'Halloran (1835–1922), his son, magistrate and minor football identity Thomas Shuldham O'Halloran (lawyer) (1865–1945), his grandson, SAFL football official
See also Tom O'Halleran (born 1946), American politician