| Country: | Tasmania |
| Type: | parliamentary |
| Ongoing: | no |
| Election Date: | 30 June 1917 |
| Vote Type: | First preference |
| Image1: | William Spence.jpg |
| Candidate1: | William Spence |
| Party1: | Nationalist Party (Australia) |
| Popular Vote1: | 6,665 |
| Percentage1: | 56.06% |
| Swing1: | 2.73pp |
| Candidate2: | James Hurst |
| Party2: | Australian Labor Party |
| Popular Vote2: | 5,225 |
| Percentage2: | 43.94% |
| Swing2: | 2.73pp |
| MP | |
| Before Election: | Charles Howroyd |
| Before Party: | Nationalist Party (Australia) |
| After Party: | Nationalist Party (Australia) |
A by-election was held for the Australian House of Representatives seat of Darwin on 30 June 1917. This was triggered by the death of Nationalist MP Charles Howroyd.
The by-election was won by Nationalist candidate William Spence, who had been defeated in his own seat of Darling at the 1917 election.