| Country: | Tasmania |
| Type: | parliamentary |
| Ongoing: | no |
| Election Date: | 27 May 1939 |
| Vote Type: | First preference |
| Image1: | Lancelot Spurr.png |
| Candidate1: | Lancelot Spurr |
| Party1: | Australian Labor Party |
| Popular Vote1: | 6,568 |
| Percentage1: | 29.3% |
| Swing1: | 3.6pp |
| Candidate2: | Allan Guy |
| Party2: | United Australia Party |
| Popular Vote2: | 6,673 |
| Percentage2: | 29.7% |
| Candidate4: | Maurice Weston |
| Party4: | Australian Labor Party |
| Popular Vote4: | 3,925 |
| Percentage4: | 17.5% |
| Swing4: | 17.5pp |
| Candidate5: | Donald Cameron |
| Party5: | United Australia Party |
| Popular Vote5: | 2,657 |
| Percentage5: | 11.8% |
| Swing5: | 11.8pp |
| 1Blank: | TCP |
| 2Blank: | TCP swing |
| 1Data1: | 50.1% |
| 2Data1: | 5.3pp |
| 1Data2: | 49.8% |
| 2Data2: | 5.3pp |
| MP | |
| Before Election: | Joseph Lyons |
| Before Party: | United Australia Party |
| After Election: | Kevin Newman |
| After Party: | Australian Labor Party |
A by-election was held for the Australian House of Representatives seat of Wilmot on 27 May 1939. This was triggered by the death of Prime Minister Joseph Lyons, a member of the United Australia Party.
The by-election was won by Labor candidate Lancelot Spurr.