Marcus Willoughby Owen (4 April 1935 – December 1987) was a Welsh professional snooker player.
Before turning professional, Owen won the English Under-16 Championship in 1949, and reached the final in 1950. Owen also won the English Amateur Championship on four occasions, in 1958, 1959, 1967 and 1973.
His elder brother Gary was a professional snooker player, and Marcus followed him into the professional game in 1973, entering the 1974 World Championship. There, he beat Dennis Taylor (8-1) and Maurice Parkin (8-5) to set up a last-16 meeting with Gary. Gary held Marcus to 5âÂÂ5 at one point, but could not prevent him from pulling away to reach the quarter-final with a 15âÂÂ8 victory. Facing defending champion Ray Reardon, Marcus recovered from 3âÂÂ9 to 7âÂÂ9 but was eventually defeated 11âÂÂ15.
Owen next played a quarter-final at the 1982 Welsh Professional Championship, which was itself an eight-man event. He lost his first match 0âÂÂ6 to Cliff Wilson.
Owen had no further success in professional snooker, his last match being a 0âÂÂ6 loss to Tony Chappel in the first round of the 1985 edition of the Welsh Professional Championship; having held 17th place in the inaugural world rankings in 1976, he had not occupied a position on the list since 1980.
He resigned as a professional player in 1987.
Owen died in hospital in December 1987, under 'tragic circumstances'.