| Election Name: | 1937 Hemel Hempstead by-election |
| Type: | parliamentary |
| Country: | United Kingdom |
| Seats For Election: | Constituency of Hemel Hempstead |
| Ongoing: | no |
| Previous Election: | 1935 United Kingdom general election |
| Previous Year: | 1935 |
| Next Election: | 1945 United Kingdom general election |
| Next Year: | 1945 |
| Election Date: | 22 June 1937 |
| Candidate1: | Frances Davidson |
| Image1: | Con |
| Party1: | Conservative Party (UK) |
| Popular Vote1: | 14,992 |
| Percentage1: | 57.7% |
| Swing1: | 4.8% |
| Candidate2: | Margery Corbett Ashby |
| Party2: | Liberal Party (UK) |
| Popular Vote2: | 7,347 |
| Percentage2: | 28.3% |
| Swing2: | 6.3% |
| Candidate3: | Charles William James |
| Image3: | Lab |
| Party3: | Labour Party (UK) |
| Popular Vote3: | 3,651 |
| Percentage3: | 14.0% |
| Swing3: | 1.4% |
| MP | |
| Before Election: | J. C. C. Davidson |
| Before Party: | Conservative Party (UK) |
| After Election: | Frances Davidson |
| After Party: | Conservative Party (UK) |
| Turnout: | 55.0% (14.3%) |
The 1937 Hemel Hempstead by-election was held on 22 June 1937. The by-election was held due to the elevation to the peerage of the incumbent Conservative MP, J. C. C. Davidson. It was won by the Conservative candidate, his wife Frances Davidson, Viscountess Davidson.