Chan Koonchung (born 1952) is a Chinese science-fiction writer who has previously lived in Hong Kong, Taiwan, and the United States.

He is the founder of Green Power (綠色力量), Green Garden Organic Farm (綠田園有機農場) and the Hong Kong Film Directors Association (香港電影導演會) among other organizations, and is currently on the international board of directors of Greenpeace.

Previously, he worked as a reporter for the Hong Kong tabloid, The Star.

In 1976 he co-founded City Magazine (號外) with Qiu Shiwen and Deng Xiaoyu and Hu Junyi.

In 1991 he played the role of Professor Liu Yuebai in Yan Hao and Tsui Hark's adaptation of Ah Cheng's 1984 novel, The Chess Master.