Benjamin Sinclair Johnson, CM OOnt (born December 30, 1961) is a Canadian former sprinter. During the 1987–88 season he held the title of the world's fastest man, breaking both the 100 m and the 60 m indoor World Records. He won the 100 metres at the 1987 World Championships in Athletics; and at the 1988 Summer Olympics, but was disqualified for doping and stripped of the gold medals. He was the first one to beat the 9.9 and 9.8 seconds barrier.

He won two bronze medals at the 1984 Summer Olympics, as well as gold medals at the 1985 World Indoor Championships, 1986 Goodwill Games and 1986 Commonwealth Games. He was trained by Charlie Francis.

Benjamin Johnson was born in Falmouth, Jamaica, and emigrated to Canada in 1976. He grew up in the Lawrence Heights community of Toronto, before later residing in the suburb of Scarborough, Ontario. His early life was met with challenges regarding his Black immigrant status in a white-dominant society, which built up to lead him to beg his parents to emigrate back, however, he decided to stay.

Johnson met coach Charlie Francis and joined the Scarborough Optimists track and field club, training at York University. Francis was a Canadian 100 metres sprint champion himself (1970, 1971 and 1973) and a member of the Canadian team for the 1972 Summer Olympics in Munich. Francis was also Canada's national sprint coach for nine years.

Johnson's first international success came when he won 2 silver medals at the 1982 Commonwealth Games in Brisbane, Australia. He finished behind Allan Wells of Scotland in the 100 metres with a time of 10.05 seconds and was a member of the Canadian 4 × 100 metres relay team which finished behind Nigeria. This success was not repeated at the 1983 World Championships in Helsinki, where he was eliminated in the semi-finals, finishing 6th with a time of 10.44, nor at the 1983 Pan American Games in Caracas where Johnson placed 5th in the 100 metres final with a time of 10.25.

At the 1984 Summer Olympics in Los Angeles, he reached the 100 metres final; after a false start, he won the bronze medal behind Carl Lewis and Sam Graddy with a time of 10.22. He also won a bronze medal with the Canadian 4 × 100 m relay team of Johnson, Tony Sharpe, Desai Williams and Sterling Hinds, who ran a time of 38.70. By the end of the 1984 season, Johnson had established himself as Canada's top sprinter, and on August 22 in Zürich, Switzerland, he bettered Williams' Canadian record of 10.17 by running 10.12.

In 1985, after eight consecutive losses, Johnson finally beat Carl Lewis. Other success against Lewis included the 1986 Goodwill Games, where Johnson beat Lewis, running 9.95 for first place, against Lewis' third-place time of 10.06. He broke Houston McTear's seven-year-old world record in the 60 metres in 1986, with a time of 6.50 seconds. He also won Commonwealth gold at the 1986 games in Edinburgh, beating Linford Christie for the 100 metres title with a time of 10.07. Johnson also led the Canadian 4 × 100 metres relay team to gold, and won a bronze in the 200 metres. Also in 1986, Canadian sprinter Mike Dwyer expressed concern that the use of drugs had reached "epidemic proportions" among Canadian sprinters, particularly among those who trained in the Toronto area. Atlee Mahorn also speculated that many sprinters were on steroids.

On April 29, 1987, Johnson was invested as a Member of the Order of Canada. "World record holder for the indoor 60-metre run, this Ontarian has proved himself to be the world's fastest human being and has broken Canadian, Commonwealth and World Cup 100-metre records," it read. "Recipient of the Norton Crowe Award for Male Athlete of the Year for 1985, 'Big Ben' was the winner of the 1986 Lou Marsh Trophy as Canada's top athlete."