The 29-year-old England defender, who has been dogged by persistent knee problems in recent years and is in Fabio Capello's 30-man provisional World Cup squad, is a product of the Spurs academy and has made 290 first-team appearances since turning professional in 1998.
King told the club's official website: "I am delighted to have signed a new contract with Spurs.
"I have been here since I was a schoolboy and I could never see myself going anywhere else. This is where I want to continue playing my football."
He added: "We've got the prospect of Champions League football to look forward to next season and with the quality of players we have I believe we are on the brink of something big.
"It is an exciting time for the club with a new training ground being built and plans for a new stadium.
"I am enjoying my football and I want to be a part of what is happening here."
Source: PA
Source: PA