Alfred Hindmarsh Labour Bob Semple Labour The Wellington South by-election of 1918 was a by-election held in the Wellington South electorate during the 19th New Zealand Parliament, on 19 December 1918.

It was caused by the death of incumbent MP Alfred Hindmarsh,[1] the leader of the Labour Party and was won by fellow party member Bob Semple with a majority of 1,231.

[2] Bob Semple, a miners agent who was previously the organiser of the New Zealand Federation of Labour, was selected as the Labour Party candidate.

The unsuccessful aspirants were Tom Brindle, Alec Monteith, John Read, Michael Reardon and Tom Young.

[3] Two Wellington City Councillors also stood as candidates.