Ng Chung-yin (Chinese: 吳仲賢; 1946 – 21 April 1994) was a Hong Kong Trotskyist activist. He made his fame in the student strike at the Chu Hai College in 1969 and became an influential figure in the 1960s and 70s student movements. He was the founder of the Revolutionary Marxist League, a Trotskyist revolutionary vanguard party in 1973. He also work in the media industry in the 1980s and 90s until he died of cancer in 1994.