The Leeds North East by-election, 1940 was a parliamentary by-election in England held on 13 March 1940 to elect a new Member of Parliament (MP) for the House of Commons constituency of Leeds North East. The vacancy was caused by the resignation on 8 February 1940 of the sitting Member, Sir John Birchall, through the procedural device of appointment as Steward of the Chiltern Hundreds. He had held the seat since its creation for the 1918 general election.