The 1940 Southampton by-election was held on 27 November 1940.
The by-election was held due to the elevation to the peerage of the incumbent National MP, Sir John Reith.
It was won by the Liberal National candidate Russell Thomas.
[1] This was the last uncontested Parliamentary election to date where it resulted in a gain for the winning party.
This article about a by-election to the Parliament of the United Kingdom in England is a stub.