- Source: 1921 Hertford by-election
- 1921 Hertford by-election
- List of ministerial by-elections to the Parliament of the United Kingdom
- 1921 Abingdon by-election
- 1921 Bewdley by-election
- Independent Parliamentary Group
- 1921 Bedford by-election
- 1921 Westhoughton by-election
- Murray Sueter
- 1921 Caerphilly by-election
- 1921 Kirkcaldy Burghs by-election
The 1921 East Hertfordshire division by-election was held on 16 July 1921. It had been necessitated by the resignation of the incumbent MP, Noel Pemberton Billing due to ill-health. The seat was gained from the Unionist Party by the Anti-Waste League.