Albion defenders Lewis Dunk and Shane Duffy have signed new long-term contracts with the club until June 2023.
Youth-team graduate Dunk has made more than 200 appearances for the club, while Duffy joined the Seagulls from Blackburn for a then club-record fee in August 2016.
Albion boss Chris Hughton said: “I am delighted for both Lewis and Shane. They have been terrific players for the club; helping us win promotion and establish ourselves in the Premier League last season.
“They have formed a very good central defensive partnership, and have played a really important role in what we’ve achieved.
“Both are vital members of the squad, and it’s very pleasing that they’ve committed their long-term futures to the club.”
Dunk said: “I’m very pleased. I’ve been here since I was a little boy from the age of ten years old, so to commit to another five years to this fantastic club is an amazing feeling.
“It was such an easy decision; I’m here in my hometown playing football in the Premier League with these amazing fans behind us.