William O'Halloran may refer to:
*
William O'Halloran (trade unionist), pioneer of trade unionism in Galway, Ireland
*
William O'Halloran (cricketer), Australian cricketer
*
William Littlejohn O'Halloran
William Littlejohn O'Halloran (5 May 1806 – 15 July 1885) was a British Army officer and public servant in South Australia.
Early life and army
O'Halloran was born in Ireland on 5 May 1806(or born at Berhampore, India, and came to England in 18 ...
, British Army officer and public servant in South Australia
{{hndis, Ohalloran, William