The Spaniard has put pen to paper on what is believed to be a
four-year deal following a breakthrough season at the Emirates.
The former Barcelona right-back made 28 appearances for the Gunners last term and impressed both in defence and going forwards, scoring twice against Aston Villa and Liverpool.
Bellerin joined Arsenal in 2011 from Barcelona's La Masia academy and he had been linked with a move back to the Catalan giants but he has now ended any speculation over his future.
He has represented Spain at Under-17, Under-19 and Under-21 level.
Earlier this month, Bellerin spoke of his desire to build on last season and help Arsene Wenger's side to more silverware.
He said: "My goal has always been to improve, work hard and fight for a place in the starting XI.
"Last season I got the minutes that I was hoping for and I hope that next season I can do the same.
"I’m really, really excited for the new season. The way we finished this season, the team have really come together and we’ve had some great performances, especially since the New Year.
"The team really feel like we can beat any team in the world with the performances we’ve had, so we’re all really, really excited to hopefully start the season with the right mindset and with the right results.
"Hopefully by the end of next season we can win some more trophies."
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