The new deal will keep the 39-year-old at Old Trafford until at least June 2011.
“Edwin’s professionalism and dedication to his job and the way he looks after himself has given him the longevity in the game,” United boss Sir Alex Ferguson told the club’s official website.
“That longevity includes such great experience not just at United, but at Juventus, Ajax and on an international level. We are absolutely delighted he is continuing for another year.”
“I still feel good and am enjoying my football,” Van der Sar told the club’s official website.
“This is a great club and I was shown a great deal of compassion and support during a difficult time in December and January for which I am extremely grateful. I am looking forward to winning more trophies with this great team.”