- Source: 1921 Mid Down by-election
- Britania Raya
- 1921 Mid Down by-election
- 1921 Mid Armagh by-election
- 1921 West Down by-election
- 1921 Bedford by-election
- 1921 Bewdley by-election
- 1921 Hertford by-election
- 1921 Abingdon by-election
- 1921 Hereford by-election
- 1921 Taunton by-election
- List of ministerial by-elections to the Parliament of the United Kingdom
The 1921 Mid Down by-election was held on 2 July 1921. The by-election was held due to the incumbent Ulster Unionist MP, James Craig, being elected Prime Minister of Northern Ireland. It was won by the UUP candidate Robert Sharman-Crawford.