| Country: | South Australia |
| Type: | parliamentary |
| Ongoing: | no |
| Election Date: | 11 February 1994 |
| Candidate1: | Martyn Evans |
| Party1: | Australian Labor Party |
| Popular Vote1: | 29,097 |
| Percentage1: | 45.92% |
| Swing1: | 9.68pp |
| Candidate2: | Andy Markwell |
| Party2: | Liberal Party of Australia |
| Popular Vote2: | 20,398 |
| Percentage2: | 32.19% |
| Swing2: | 3.50pp |
| 1Blank: | TPP |
| 2Blank: | TPP swing |
| 1Data1: | 56.90% |
| 2Data1: | 7.85pp |
| 1Data2: | 43.10% |
| 2Data2: | 7.85pp |
| MP | |
| Before Election: | Neal Blewett |
| Before Party: | Australian Labor Party |
| After Election: | Martyn Evans |
| After Party: | Australian Labor Party |
The 1994 Bonython by-election was held in the Australian federal electorate of Bonython in South Australia on 19 March 1994. The by-election was triggered by the retirement of the sitting member, the Australian Labor Party's Neal Blewett, on 11 February 1994. The writ for the by-election was issued on the same day.