"Laurent has proven himself to be an outstanding player since joining us in 2010 and has shown his quality once again this season. I am delighted he has decided to commit his future to the club," manager Arsene Wenger told the club's website (www.arsenal.com).
French international Koscielny has made 163 appearances in all competitions for the Londoners since joining from Lorient, more than any other Arsenal player over the same period.
He has made 31 Premier League appearances this season, helping Arsenal keep 15 clean sheets.
Fourth-placed Arsenal visit Norwich City in their final league game of the season on Sunday and the following weekend take on Hull City in the FA Cup final.
(Reporting by Justin Palmer; editing by Tony Jimenez)
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