Pat's current contract was due to end in November this year and he has put pen to paper on a deal which will now keep him at Wigan for 2012 and 2013.
The signing has put an end to the recent media speculation that Richards was set to head back to the NRL or was planning to switch codes.
Joining Wigan in 2006 from the Wests Tigers Club in the NRL, Pat has become a fans favourite at the DW Stadium finishing 2010 as both Wigan Warriors and Super League Top Try Scorer with 32 touchdowns, kicking 167 goals. He also swept the board at the Club's End of Season Awards Dinner where he was recognised as the Player of the Year, the Players' Player of the Year and the Coach's Player of the Year. Pat was also the winner of the Rugby League Writers Association Award last year and received the ultimate individual honour of the Man of Steel Award which is voted for by his fellow players. Earlier this week the 29 year old was included in the Exiles squad to face England in June.
Chairman Ian Lenagan said: