The 35-year-old, who became the all-time Premiership appearance holder in September, will remain at Allianz Park until the summer of 2020, taking him up to 10 seasons with the Men in Black.
Wigglesworth won domestic honours in his first Sarries campaign in 2010/11 and has gone on to add a further three English titles to his name as well as two European Cups.
A key part of the squad for many years, his performances have seen him eclipse the 200-game mark as well as earn a recall to the England squad.
On his new deal, Wigglesworth said: “I’ve been lucky enough to have been part of the club for nine years and I don’t think there’s too many people who have wanted to leave, and there’s a lot of people who have wanted come.
“I’m just one of those many people who want to be associated with the club. I’ve enjoyed a lot of success here and I’m not interested in that finishing at the moment.”
Director of rugby Mark McCall added: “He’s incredibly professional. He’s understood the need to look after his body and there’s nobody more diligent when it comes to that side of things.
“It says something about his determination and competitiveness that at his age he’s been able to force his way back into England reckoning. It’s an incredible achievement and it’s great for us to keep him on for another year.”