Kirk Cyron Johnson (born June 29, 1972) is a Canadian former professional boxer who competed from 1993 to 2010, and challenged once for the WBA heavyweight title in 2002.

Johnson represented Canada at the 1992 Olympics in Barcelona, where he lost in the quarter-finals against eventual silver medallist David Izon (Nigeria).

Junior World Championships, Bayamon, Puerto Rico, August 1989: Trofeo Italia, Mestre, Venice, Italy, March 1991: World Championships, Sydney, Australia, November 1991: Box-Am Tournament, Badalona, Spain, February 1992: North & Central American Olympic Qualifications, Santo Domingo, Dominican Republic, April 1992: Summer Olympics, Barcelona, Spain, July–August 1992:

On December 6, 2003, Johnson faced the Ukrainian contender and future champion Vitali Klitschko in New York's Madison Square Garden.

In 2003, after dropping out of a planned fight against then-heavyweight champion Lennox Lewis because of an injury, Johnson launched a protracted legal battle against the Halifax Regional Police.