The 2008–09 Slovenian PrvaLiga was the 18th season of top-tier football league in Slovenia.
The competition was officially called PrvaLiga Telekom Slovenije for sponsorship reasons.
In the previous season, Livar were relegated to the Slovenian Second League after just one year in the top division, finishing last with only 17 points.
The ninth-placed team of the PrvaLiga, Drava Ptuj, played a two-legged relegation play-off against the runners-up of the 2008–09 Slovenian Second League, Aluminij.
Each team played four times against their opponents, twice at home and twice on the road, for a total of 36 matches.