"Playing for this great club makes me so proud. And as always I would like to thank the fans who have continually supported me."
Terry appeared to be being phased out at Chelsea under Mourinho’s predecessor, Rafael Benitez, with injuries contributing to a lack of match action.
Frank Lampard and Ashley Cole left after lengthy stays at Stamford Bridge at the end of last season, but Terry was given a new contract less than 48 hours after the close of Mourinho’s first term back at Chelsea.
The former England captain, who graduated from Chelsea’s academy and made his first-team debut in 1998, has been rejuvenated by the return of the Portuguese, who says the deal has been earned on merit.
Mourinho said: "This new contract is not to say ‘thank you very much’; it is because John continues to perform. He is a top defender.
"I am happy that he completely deserves this new contract after a season where he has already played 40 matches."