Greenock by-election, 1936

The Greenock by-election, 1936 was a by-election held on 26 November 1936 for the House of Commons constituency of Greenock in Renfrewshire, Scotland.

The seat had become vacant on 13 October 1936 when the Secretary of State for Scotland, Sir Godfrey Collins had died at the age of 61. A National Liberal Member of Parliament (MP), he had held the seat since the January 1910 general election.

The National Liberal candidate was V. E. Cornelius, who had not previously contested a parliamentary election.

His only opponent was the Labour Party candidate, 50-year-old Robert Gibson. Gibson had unsuccessfully contested one by-election and three general elections most recently at Dundee in 1935.

On a high turnout, the result was a victory for Gibson, who won the seat with a swing of nearly 8%. He held the seat until his resignation in 1941.