A Dáil by-election was held in the constituency of Dublin South in Ireland on Tuesday, 6 June 1939, to fill a vacancy in the 10th Dáil. It followed the death of Fine Gael TD James Beckett on 19 December 1938.
In 1939, Dublin South was a seven-seat constituency which included the wards of Fitzwilliam, Merchants Quay, Mansion House, New Kilmainham, Royal Exchange, South City, South Dock, Trinity, Ushers Quay and Wood Quay; and also included Ringsend.
The writ of election to fill the vacancy was agreed by the Dáil on 17 May 1939.
It was the first by-election held in Ireland after the Constitution of Ireland came into force on 29 December 1937.
The by-election was won by the Fianna Fáil candidate John McCann.
Result
References