Mark Johnson (born February 7, 1966) is a British thoroughbred horse racing announcer in both the United States and United Kingdom.

Born in Skegness, Lincolnshire, Johnson attended King Alfred's College in Winchester, Hampshire and London College of Printing in Elephant and Castle, London receiving a bachelor's degree in television, film, and theatre studies, and a postgraduate diploma in radio journalism. His first race commentary was in 1986 at Tweseldown Racecourse in Fleet, Hampshire. In 1995, he called his first Classic, the St. Leger Stakes at Doncaster Racecourse in South Yorkshire, and as of May 2009, had announced eleven St. Legers, and five Epsom Derbies. He has also announced multiple Cheltenham Gold Cup and Grand National steeplechase races.

Following the unexpected death of announcer, Luke Kruytbosch, Johnson became the track announcer at Churchill Downs in Louisville, Kentucky in January 2009, calling his first Kentucky Derby later that year. He also does paddock commentary with Jill Byrne at Churchill Downs.

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