Newcastle under Lyme by election, 1942

The Newcastle-under-Lyme by-election, 1942 was a by-election held for the British House of Commons constituency of Newcastle-under-Lyme on 11 March 1942. The seat had become vacant when the Labour Member of Parliament (MP) Josiah Wedgwood was elevated to the peerage as Baron Wedgwood. He had held the seat since the 1906 general election.

The Labour candidate, John Mack, was returned unopposed; during the Second World War the parties in the wartime coalition government had a pact not to contest by-elections in seats held. He represented the constituency until he retired from the House of Commons at the 1951 general election.