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. [2]
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| National Liberal | Russell Thomas | Unopposed | |||
| National Liberal gain from National | |||||