The teenage stopper will now remain at Ewood Park until the summer of 2018 and his fresh contract caps a memorable month after he made his senior Rovers bow in the 3-0 victory at Leeds.
Raya has previously impressed in a non-league stint with Southport, who, like Blackburn, had a memorable FA Cup run this season.
“Working hard has paid off for me because I made my debut a couple of weeks ago and now I’ve signed my second pro contract for Blackburn, so I’m very happy,” Raya told the club’s official website.
“It has been a great year for me. I’ve grown up as a player and as a person. I went on loan to Southport, which was a really good experience, playing regularly at a good level.
“Then, my debut against Leeds, walking off that pitch with a 3-0 win and keeping a clean sheet and playing well, it was a great feeling.
“The next step for me is to try and get a regular place in the team and to try to play as many games as I can.
“As soon as you make your debut you want to play more first-team games, but I know I need to keep working hard to get in the team.”