The 1940 Mitcham by-election was held on 19 August 1940. The by-election was held due to the death of the incumbent Conservative MP, Richard Meller. It was won by the Conservative candidate Malcolm Robertson, who was unopposed as during the Second World War the political parties in the Coalition Government had agreed not to contest by-elections when a vacancy arose in any of the seats held by the other coalition parties.
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- 1940 elections in the United Kingdom
- 1940 in England
- 20th century in Surrey
- By-elections to the Parliament of the United Kingdom in Surrey constituencies
- By-elections to the Parliament of the United Kingdom in London constituencies
- Elections in the London Borough of Merton
- Unopposed by-elections to the Parliament of the United Kingdom (need citation)
- August 1940 events in the United Kingdom
- By-elections to the Parliament of the United Kingdom in London constituency stubs