Actor and retired wrestler Mick Foley tweeted: "I am so sorry to hear of the passing of the great Rocky Johnson. Always a gentleman, I always enjoyed talking with him.
"My deepest condolences to his family, friends, and the fans who loved him. A very sad day for wrestling."
Matt Hardy, who wrestled alongside his brother Jeff as the Hardy Boyz, wrote: "Saddened to hear about the passing of Rocky Johnson.
"Rocky was always extremely friendly and kind to me every time I interacted with him over the years. My condolences and thoughts go out to his family."
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American wrestler Dana Brooke added: "My heart goes out to the family of @TheRock and may prayers be sent your way during this time! I am sorry for your loss!"
Johnson began his career as a wrestler in 1964 in South Ontario, and soon after legally changed his name to his "Rocky Johnson" moniker.
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He was recruited by the World Wrestling Federation where he feuded with the likes of Greg "The Hammer" Valentine, Don Muraco and Adrian Adonis.
He also enjoyed success when he teamed up with Tony Atlas as The Soul Patrol, with the two men becoming the first African-American World Tag Team Champions in WWE history in 1983.