The Cameroon international has fallen down the pecking order in the past 12 months at White Hart Lane and has now signed a three-year deal at Carrow Road
Bassong moved to White Hart Lane in 2009 for £8 million but fell out of favor last season, spending the second half of the campaign at Wolves.
The Cameroon international tweeted: "Morning tweeps!! I've been officially transferred to Norwich today! 3 years deal! Another chapter in my football life!
"I wish all the best to my old team mate at Spurs!! I've had great time with them! I hope they'll success!"
Bassong was first introduced to English football at Newcastle United, who signed him from Metz in 2008. The Frecnh-born defender was unable to prevent the Magpies' relegation from the top flight, but impressed enough to earn a move to Spurs.
The defender made 72 appearances in three seasons in north London and has featured 15 times for Cameroon's national side.
He becomes Chris Hughton's second center back signing in recent weeks, following the arrival of Michael Turner from Sunderland.
The Carrow Road boss told the club's official website: "Sebastien is a player that I have known well since my time at Newcastle and I’m delighted to have brought in someone with the Premier League experience he has got.
"He will give us power and pace at the back and again add to the competition in the squad."