Legendary boxing promoter Don King is recovering from kidney stone surgery ... TMZ Sports has learned.
A rep for the World Boxing Commission confirmed King was hospitalized ... after doctors located several kidney stones in the 83-year-old's body.
We're told he's recovering at the hospital -- surgery went well and he's doing fine.
King was recently out in public to speak at an event at Howard University on March 28th and seemed fine.
We've reached out to King's family for comment -- so far, no word back.