| Country: | New South Wales |
| Type: | parliamentary |
| Ongoing: | no |
| Election Date: | 8 May 1937 |
| Vote Type: | Popular |
| Image1: | William Scully.jpg |
| Candidate1: | William Scully |
| Party1: | Australian Labor Party |
| Popular Vote1: | 25,551 |
| Percentage1: | 52.3% |
| Swing1: | 44.2pp |
| Candidate2: | Ernest Batchelor |
| Party2: | Country |
| Popular Vote2: | 13,168 |
| Percentage2: | 27.0% |
| Swing2: | 4.8pp |
| MP | |
| Before Election: | Aubrey Abbott |
| Before Party: | Country |
| After Election: | William Scully |
| After Party: | Australian Labor Party |
| Election Name: | 1937 Gwydir by-election |
| 1Data2: | 45.7% |
| 2Blank: | TPP swing |
| 2Data1: | 54.3pp |
| 2Data2: | 8.8pp |
| 1Data1: | 54.3% |
| 1Blank: | TPP |
| Candidate3: | Oliver Milling |
| Party3: | Country |
| Popular Vote3: | 8,155 |
| Percentage3: | 16.7% |
| Swing3: | 16.7pp |
A by-election was held for the Australian House of Representatives seat of Gwydir on 8 May 1937. This was triggered by the resignation of Country Party MP Aubrey Abbott to become Administrator of the Northern Territory.
The by-election was won by Labor candidate William Scully.