Ng Ming-yum (Chinese: 吳明欽; 13 April 1955 – 22 June 1992) was a Hong Kong politician and writer. He was a key founder of the United Democrats of Hong Kong (forerunner of the Democratic Party), a member of the Tuen Mun District Council, an elected member of the Regional Council and the youngest member of the Legislative Council to die in office. He supported the Tiananmen Square protesters in 1989, and is remembered for carrying a flag, leading a supporting crowd during the related protest in Hong Kong.^{[citation needed]}

A writer for Breakthrough Magazine (Chinese: 突破; a Christian magazine published in Hong Kong from 1973 to 1999), Lee Wing-Tat was an ally of Ng inside the party and carried his portrait at his funeral. He would later become Democratic Party chairman.

Ng was a secondary school teacher and took an active role in community affairs. In 1971, he joined a demonstration asserting China's territorial rights over the Diaoyutai Islands. He was also active in the "Anti-corruption, Arrest Godber" movement in 1973. In the 1980s, he was deeply involved in the Meeting Point pressure group, and represented the group to win a seat on Tuen Mun District Council in 1985, securing the most votes in the territory. He went on to be re-elected with high votes in 1988 and 1991. In 1991, he won a seat on the Legislative Council.

Ng was diagnosed with blood cancer in February 1992, but continued to work long hours, even making policy proposals from his hospital bed. Despite his deteriorating health, on 4 June 1992 he attended a candlelight vigil in memory of the people who was killed during the Tiananmen massacre three years earlier.

A few weeks later, during a fundraising campaign on 22 June 1992, he fainted and died. LegCo members observed a moment of silence before the legislature sat in his memory two days later. He was the only LegCo member ever to receive this honour. He was survived by his wife, a son and a daughter.

In the LegCo by-election that followed Ng's death, his colleague Albert Ho, later chairman of the Democratic Party, stood but failed to win, later recognising that he lacked Ng's close ties to the area. He nevertheless took on the office and staff that Ng had run, and went to represent the area in Legco and on Tuen Mun District Council.^[4]

• 燃點此生 (1992), published by Breakthrough
• 昨天的努力，明天的見證 (1992), published by Breakthrough