The 2008–09 Welsh Premier League was the 17th season of the Welsh Premier League since its establishment in 1992 as the League of Wales.
It began on 15 August 2008 and ended on 25 April 2009.
[1] Llanelli were the defending champions.
Prestatyn Town were promoted from the Cymru Alliance and played in the top division for the first time in their history.
Caersws survived relegation after none of the top two teams in the divisions below could meet ground regulations.