| Election Name: | 1941 Hornsey by-election |
| Type: | parliamentary |
| Country: | United Kingdom |
| Seats For Election: | Constituency of Hornsey |
| Ongoing: | no |
| Previous Election: | 1935 United Kingdom general election |
| Previous Year: | 1935 |
| Election Date: | 28 May 1941 |
| Candidate1: | David Gammans |
| Image1: | Con |
| Party1: | Conservative Party (UK) |
| Popular Vote1: | 11,077 |
| Percentage1: | 72.8% |
| Swing1: | 7.9% |
| Candidate2: | Noel Pemberton Billing |
| Party2: | National Independent |
| Popular Vote2: | 4,146 |
| Percentage2: | 27.2% |
| MP | |
| Posttitle: | Subsequent MP |
| Before Election: | Euan Wallace |
| Before Party: | Conservative Party (UK) |
| After Election: | Muriel Gammans |
| After Party: | Conservative Party (UK) |
| Turnout: | 21.1% (45.9%) |
| Next Election: | 1945 United Kingdom general election |
| Next Year: | 1945 |
The 1941 Hornsey by-election was held on 28 May 1941. The by-election was held due to the death of the incumbent Conservative MP, Euan Wallace. It was won by the Conservative candidate David Gammans.