Gregory de Lisle Armstrong (born 11 May 1950) was a West Indies cricketer who was an assistant manager in the 1982-83 rebel tour of South Africa.Born in Saint Michael, Barbados, a right-arm fast bowler, Armstrong showed promise in his first season with Barbados in 1973-74, taking 4 for 45 on debut against Trinidad in Bridgetown. He was selected for the President's XI match against MCC a few days later but failed to take a wicket, and he played only a minor part in Barbados's victory over the MCC later in the tour. He had a stint with Glamorgan after they signed him in 1974. He took 45 wickets at 31.00 in the 1975 season, including career-best figures of 6 for 91 against Warwickshire at Swansea, but he was unable to settle into a rhythmic run-up, and bowled an excessive number of no-balls. He was even less successful in 1976, with 25 wickets at 37.08, and his county contract was not renewed. He returned to Barbados and played three matches in 1977-78, hitting his highest score of 93, batting at number nine, against Combined Leeward and Windward Islands at Castries, but took only one wicket. In his first-class career from 1973-74 to 1977-78 he scored 642 runs at 15.28 in 40 matches, and took 91 wickets at 35.15. After the rebel tour the West Indian authorities banned him for life.