| Competition: | Tonga Major League |
| Season: | 2005 |
| Winners: | Lotoha'apai United |
| Prevseason: | 2004 |
| Nextseason: | 2006 |
The 2005 season of the Tonga Major League was the 27th season of top flight association football competition in Tonga.[1] Lotohaʻapai United won the championship for the eighth time, the 8th in a record streak of 11 titles in the Tonga Major League.