Peter Whiteside (12 May 1870 – 19 September 1929) was an Australian-born South African trade union leader and politician.
Born in Ballarat, Whiteside was educated in Melbourne before becoming a mechanic on the city's cable tramway system.
Three years later, he was the founder secretary of the Benoni branch of the Engine Drivers' and Firemen's Association, also becoming a delegate to the union's executive council.
[1] After the war, Whiteside returned to the railways, until in 1902, he was elected as general secretary of his union.
He championed the construction of the Johannesburg Trades Hall, and served on a Labour Commission, on which he signed a minority report opposing Chinese immigration.