Royce worked as a stand-up comedian and a warm-up artist on ITV shows The X Factor and BGT.
In a statement on his official Twitter account on Tuesday, his daughter Roxanne wrote: “It is with our greatest regret that we have to tell you all that Ian has passed away today from severe pneumonia and multiple organ failure.
“He was in no pain and was surrounded by friends and family. He put up a good fight but is in a better place now. Roxanne x”
Ant and Dec have paid tribute to Royce, describing the comedian as an “integral part” of the team.
“We are sorry to hear of the passing of Ian ‘Roycey’ Royce,” the presenting duo said.
“He was an integral part of the #BGT team for many years.
“Our thoughts are with his beloved Roxy and all his family. RIP Roycey. We’ll never forget you. X.”
Royce had previously revealed he was an alcoholic and shared an appeal online to raise funds for rehab.
In September last year, he tagged stars including Ant and Dec, Simon Cowell and Robbie Williams, saying: “I am so grateful to so many for saving my life…..”
He added: “Thank you for a light…..”
Piers Morgan wrote: “Funniest warm-up man in showbiz and a legend in the TV industry. Worked with him on @BGT, @AGT & most of my Life Stories shows.
“Great guy, very loyal friend, & such a proud dad to his daughter Roxanne. Thanks for all the laughs mate.”