The England second-row joined the Tigers from Newcastle Falcons in the summer of 2009 and has since made more than 50 starts for the club, breaking into Stuart Lancaster's England side last season.
Tigers director of rugby Richard Cockerill said: "We told Geoff that he has always been part of our plans going forward and it is very good news that he has decided to stay with us.
"His decision shows the quality of the environment we have at Leicester Tigers and that plays a big part in players wanting to stay here. Geoff wants to continue to develop as a player and he agrees with us that he can do that best by playing for Leicester Tigers."
He joins fellow England internationals Tom and Ben Youngs and Tigers forwards Graham Kitchener, Steve Mafi and Julian Salvi in agreeing deals beyond the end of the current season.
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.