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The highly-rated 21-year-old made his first-team debut for Barca in November 2011 before going on to make 22 appearances last season, playing in the league, Copa del Rey and Champions League.
This season Tello has made 16 appearances in all competitions for Barca, having represented Spain at this summer's Olympics.
A Barcelona statement read: "Barcelona announce they have reached an agreement with the player Cristian Tello to extend his contract until June 30, 2016. His buy-out clause has been set at 10 million euros.
"The player will sign his contract on Monday, December 17, in the Barcelona offices."
h Daniel. I could spend hours on this subject putting the world to rights. You can even take a step back and ask why football fans (and society in general) have this need to know that something will happen before it actually does. There are times this important, when it comes to things like war, food production and natural disasters. A man you've never met changing his job? Not so much.