10 Dec, 12:23
Ireland's John Lacey will referee his first ever RBS 6 Nations match in February, while Alain Rolland is also included in the Elite Panel in what is his last season.
He has enjoyed four seasons with the club taking with him Powergen Cup, Heineken Cup and Guinness Premiership winner's medals.
During his spell with Wasps he has made 106 appearances, scoring 16 tries and playing an integral role within the squad.
His time with the Londoners also saw him pick up recognition on the international stage, making his debut for Ireland against France as part of the 2006 RBS 6 Nations squad.
Collecting a total of 14 caps, including two appearances at the 2007 Rugby World Cup, Reddan is eager to build on his time with the national side and is heading back to Irish shores for the start of the 2009/10 season.
The Limerick man said: "It is tough for me leaving Wasps, I've thoroughly enjoyed my last four years and I can't overstate how great a club it is.
"The fitness team, physio staff and backroom team are top class and make it easy for you to be at your best week in, week out in what is a long season.
"The coaches have helped me personally and supported me over the last four years and I would like to thank them for all their help and support, particularly in my decision to go home to look to further my international career.
"I am looking forward to representing Leinster next season, they are a top club who have proved that year in, year out on the European stage and they may even go on to win the Heineken Cup come the end of the season.
"The biggest thing I will take away from Wasps is the experience of playing on the biggest day of the season, playing in the biggest games and performing consistently as a team - that is an experience that will stay with me forever.
"I would like to thank the players, coaches, staff and the supporters for making the last four years very special."