| Country: | Northern Territory |
| Type: | parliamentary |
| Ongoing: | no |
| Election Date: | 10 September 1988 |
| Party1: | Northern Territory Nationals |
| Popular Vote1: | 553 |
| Percentage1: | 31.3% |
| Swing1: | 6.2 |
| Candidate2: | Di Shanahan |
| Party2: | Australian Labor Party (Northern Territory Branch) |
| Popular Vote2: | 694 |
| Percentage2: | 39.3% |
| Swing2: | 15.0 |
| Candidate3: | June Tuzewski |
| Party3: | Country Liberal Party |
| Popular Vote3: | 520 |
| Percentage3: | 29.4% |
| Swing3: | 21.2 |
| 2Blank: | TPP swing |
| 1Data1: | 55.4% |
| 2Data1: | 55.4 |
| 1Data2: | 44.6% |
| 2Data2: | 13.6 |
| MP | |
| Before Party: | Country Liberal Party |
| After Party: | Northern Territory Nationals |
A by-election for the seat of Flynn in the Northern Territory Legislative Assembly was held on 10 September 1988. The by-election was triggered by the resignation of Country Liberal Party (CLP) member Ray Hanrahan, a former Deputy Chief Minister. The seat had been held by Hanrahan since its creation in 1987.