In his 45 appearances to date he has scored four tries.
A European Challenge Cup winner in 2009, Wilson has also played in two Churchill Cups for Ireland 'A' as well as for the Irish national team in 2005, when he became the third generation of his family to win full international honours.
Director of rugby Jim Mallinder says that Wilson is an important player for the Saints squad.
"Roger's qualities are apparent every time he plays," he said. "He provides a focus for the players around him, getting over the gain line and being in the right place at the right time. He has a good relationship with the other back rowers and scrum-halves, and brings confidence to the team.
"At 28 he is in his prime and everyone at the club is delighted that he is staying with us."
Wilson meanwhile says that he is delighted to be staying at Franklin's Gardens for the foreseeable future.
"I'm really settled here and am enjoying my rugby," he said. "It's great to be a part of a club with ambition and a high work ethic. The improvements have been remarkable over the two years I have been here. I came here because I thought we could compete in big competitions and we are. It is great that we have qualified for the quarter finals of the Heineken Cup, which is a first for me.
"I've got lots of respect for the coaches, the time and effort they put in, their expertise and the environment they have created. We have a young squad with quality players who work hard and if we keep improving at the same rate we have been there is no reason why we can't become one of the top teams in Europe."
