1934 Monmouth by-election

It was won by the Conservative candidate John Herbert.

The seat had become vacant on when the sitting Conservative Member of Parliament (MP), Sir Leolin Forestier-Walker had died at the age of 68 on 13 May 1934.

The Conservative candidate was 39-year-old John Arthur Herbert.

D Hughes, who had been the unsuccessful candidate at the 1931 general election.

On a reduced turnout, Herbert held the seat for the Conservatives, with a comfortable majority of nearly 10,000 votes.