The 2008–09 Anglo-Welsh Cup, known as the EDF Energy Cup for sponsorship reasons, was the 38th season of England's national rugby union cup competition, and the fourth to follow the recently adopted Anglo-Welsh format.

As in the previous two years, the competition is contested between the twelve teams of the Guinness Premiership and the four Welsh regions from the Celtic League.

Teams are randomly drawn into groups, as opposed to previous years when English sides were grouped according to proximity to one another.

In the pool matches, teams receive: The winner of each pool advances to the semi-finals, at which stage a draw takes place to determine the teams that will play each other.

The winners of the semi-final advance to the final to determine the competition winner; no "third place final" is played.