Three ICONS from the world of sports will crash the ballroom on the next season of "Dancing with the Stars" ... including Sugar Ray Leonard, Hines Ward and THE ORIGINAL KARATE KID!!
TMZ has learned ... Ray will be paired up with Anna Trebunskaya.
Meanwhile, Pittsburgh Steelers superstar Hines Ward will dance with Kym Johnson.
As for Ralph Macchio -- he's set to tango with Karina Smirnoff.