Marcellus Joseph Johnson (born August 13, 1971), better known as Mark "Too Sharp" Johnson, is an American former professional boxer who competed from 1990 to 2006.
He is a three-time world champion in two weight classes, having held the IBF flyweight title from 1996 to 1999; the IBF junior bantamweight title from 1999 to 2000; and the WBO junior bantamweight title from 2003 to 2004.
A fast and skilled southpaw, Johnson reached a peak Ring magazine pound for pound ranking of fifth in 1998, and is the first African-American boxer to win a flyweight world title.
In 2012 he was inducted into the International Boxing Hall of Fame.