Mark Johnston-Allen (born 28 December 1968) is an English former professional snooker player.
From Bristol, the son of David and older brother of Craig who was also a junior snooker player.
He won three consecutive Avon County Championships and won the English junior and senior champion prior to turning professional ahead of the 1988-1989 snooker season. He reached the last-16 at the 1989 British Open, recording credible wins over Terry Griffiths and Eugene Hughes, before his run was ended by former world champion Joe Johnson. After his first season as a professional he had risen to number 52 in the world rankings. Over the next couple of seasons his ranking moved down to number 59 and then back to number 52 in the world.
Johnston-Allen reached the final of the 1991 European Open while ranked #59 in the world, a run which included a 5âÂÂ0 win over Stephen Hendry, but lost 7âÂÂ9 to Tony Jones in the final. He reached the final of the same event again a year later, this time losing 9âÂÂ3 to Jimmy White. He qualified for the main stage of the World Championship in 1992, but lost 4âÂÂ10 to Tony Knowles in the first round.
At the International Open in 1995, he knocked out Hendry, Mark Williams and Ronnie O'Sullivan before losing 5âÂÂ0 to White in the quarter-finals. He defeated White en route to the semi-finals of the 1995 Thailand Open, where he lost to James Wattana. His world ranking peaked at number 31, in the 1992/1993 season, During his career, he won each of his three matches against Stephen Hendry.