Rob Holding has committed his future to Arsenal until 2024.
The English centre-back also has an option to extend the deal by another year.
After the announcement, Gunners boss Mikel Arteta said: "Since I started as manager, I have been hugely impressed with Rob's contribution to the club and the dressing room, on and off the pitch.
"The quality of his work every day on the training pitches is excellent and he is translating this into consistently high performances in matches.
"We all know Rob's quality, which he has shown in his displays during the intense moments of those two FA Cup final victories. We are all very happy that Rob has signed a new contract, he is very popular with all the players and staff, and we're looking forward to watching him continue to grow with us in the coming years."
