The new deal will keep the 36-year-old at Southampton until the summer of 2016.
Davis’ previous deal was set to expire at the end of next season.
“When I first came to this club, to say that I would have been here for this period of time is something that I would have dreamed about,” Davis told the Southampton official website.
“For that dream to have materialised and for me to be feeling good is something I am really, really pleased with.”
Manager Mauricio Pochettino said: “As club captain, Kelvin plays an extremely important role at Southampton.
“His presence in the dressing room is second to none, and his experience has proved to be vitally important to the Club as we look to achieve our aims.
“He has been a massive part of this club during his six-and-a-half years here, and there are few things in football that he hasn’t seen so far in his career.
“Every successful team needs to have characters and people like Kelvin, so I’m delighted that he has committed himself to the club for a further three-and-a-half years.”
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As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?
Being an amiable guy is good for you and Jurgen Klopp is living proof.