The 2005–06 Powergen Anglo-Welsh Cup was the 35th annual rugby union cup competition in England, and the first since it incorporated the four Welsh regional sides to become the Anglo-Welsh Cup. Whereas the competition previously featured teams from the lower levels of the English rugby pyramid, this season it was contested by the 12 teams from the English Premiership and the four Welsh regional sides from the Celtic League.

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2005–06 Powergen Anglo-Welsh Cup
Tournament details
Countries	England  Wales
Tournament format(s)	Round-robin and knockout
Date	30 September 2005 – 9 April 2006
Tournament statistics
Teams	16
Matches played	27
Final
Venue	Twickenham Stadium
Attendance	57,212
Champions	London Wasps (6th title)
Runners-up	Llanelli Scarlets
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The competition began with a pool stage, in which each pool consisted of a Welsh region and three English sides, with each team playing the others in the group once. Pool matches were played in September, October and December 2005. The team that finished top of each pool advanced to the semi-finals. The semi-finals were played at the Millennium Stadium in Cardiff on 4 March 2006, and the final was played at Twickenham Stadium in London on 9 April.

London Wasps beat Leicester Tigers 22–17 in their semi-final, while Llanelli Scarlets beat Bath 27–26 in theirs; Wasps then beat the Scarlets 26–10 in the final.

• 2005–06 English Premiership (rugby union)
• 2005–06 Celtic League

• Powergen Cup on RFU.com