Darby Riordan

David "Darby" Riordan (23 July 1886 – 15 October 1936) was an Australian politician.

Riordan was the Australian Labor Party member for Burke in the Queensland Legislative Assembly, winning the seat in 1918. He held Burke till 1929 at which time he resigned from the seat to successfully contest the House of Representatives seat of Kennedy at the 1929 federal election. He held the seat, improving his vote at each election, till his death in 1936 and succeeded by his nephew Bill.

Darcy Riordan had two brothers who were also politicians: Jim Riordan (a member of the Queensland Legislative Council from 1917 to 1922) and Ernest Riordan (a member of the Legislative Assembly of Queensland from 1936 to 1944 and 1950 to 1954).

Riordan died of pneumonia on 15 October 1936 at the Mater Misericordiae Hospital, Brisbane. He had undergone an operation to remove gallstones a few weeks earlier that left him in poor health. His funeral was held at St Stephan's Cathedral, and proceeded to the Lutwyche Cemetery.