The 26-year-old back-row has gone on to make 110 appearances for the Exiles since progressing through the academy set-up.
And the former England Under-21s international is delighted to have signed the new deal.
Thorpe said: "I have thoroughly enjoyed life at London Irish and it is a pleasure to come to work every day.
"The club has been fantastic to me over the last decade and I am now looking forward to another enjoyable two years ahead."
Irish coach Toby Booth has hailed the impact Thorpe has had on the club.
"Richard is a highly committed London Irish player who gives his all for the shirt whenever he wears it. I have coached Richard since he first started at the club and the one thing I can never fault is his effort and commitment.
"We are building a squad at Sunbury who will challenge for silverware next season and Richard will play a big part in this."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.