The Port Pirie Post Office is a heritage-listed post office at 79-83 Ellen Street, Port Pirie, South Australia. It was designed by Edward Woods and built in 1880, with extensions designed by Charles Owen-Smyth built in 1905–1907. It was added to the South Australian Heritage Register on 12 October 1995 and added to the Commonwealth Heritage List on 8 November 2011.[1][2]