Ernest Joseph "Dick" Riordan (21 September 1901 – 9 December 1954) was a Miner, Wharf labourer, and member of the Queensland Legislative Assembly.

[2] In March 1936, the member for the state seat of Bowen, Charles Collins, died and a by-election was held on the 20 June of that year.

[2] He held the seat for eight years before surprisingly losing to Fred Paterson of the Communist Party at the 1944 state election.

At the 1950 state election, Riordan stood for the reincarnated seat of Flinders, defeating the Country Party candidate, Mr G. H. Stuart by 297 votes.

[1] During his time in Parliament, Riordan was Temporary Chairman of Committees on four occasions between 1941 and 1952, Government Whip from 17 December 1942 until 14 April 1944, and Secretary for Mines and Immigration from 10 March 1952 until his death.