Mark Gregory Clayton (born April 8, 1961, in Indianapolis, Indiana) is a former American football wide receiver who played most of his career with the Miami Dolphins, entering the league in 1983 with the Dolphins and playing there until 1992. He finished out his career with the Green Bay Packers, playing a single season with them in 1993. He attended the University of Louisville. His 1984 single season record of 18 touchdown catches was broken in 1987 by Jerry Rice and is still tied for the third highest total in NFL history.