Ryall attended the Royal Academy of Dramatic Art and worked with Laurence Olivier's company with the National Theatre at the Old Vic in the late 1960s and early 1970s. A British native, Ryall was focused mainly on the stage early in his career, but he began working steadily in films and on television in the late 1980s.
His screen credits include State of Play, The Elephant Man and The Singing Detective.
In the wake of her father's death, Ryall's daughter Charlie tweeted: "Please take a moment to remember his huge five-decade-spanning career outside of the more well-known TV & film. Not just Harry Potter."
She added: "Not that I don't love Harry Potter. I do, I do. But there's so much more."
In addition to Charlie, Ryall is survived by one son and another daughter.
In Memoriam: Remember the stars we lost in 2014