"Michael died peacefully in hospital with his wife Anne and son Fergus at his bedside, following a bout of Pneumonia, " said his publicist.
After the passing of actor Richard Harris, Gambon took over the role of Albus Dumbledore.
In 2009, he explained to The LA Times that he focused on the screenwriter's words and saw "no reason to read the books."
Born in 1940 in Ireland, Gambon launched his acting career on stage and gained recognition for his exceptional talent, winning three Olivier Awards.
He achieved fame in Britain with his role in the 1986 BBC series The Singing Detective, winning him multiple awards.
While he admired Rowling's work, it wasn't his primary focus as an actor.
Gambon said in an interview once, "I didn't do Harry Potter because she wrote it, I did it for the money."
“Naughty but very, very funny,” Helen Mirren said of Gambon. “He kept me constantly in laughter.”