An environmentalist is a person who is concerned with and/or advocates for the protection of the environment. An environmentalist can be considered a supporter of the goals of the environmental movement, "a political and ethical movement that seeks to improve and protect the quality of the natural environment through changes to environmentally harmful human activities". An environmentalist is engaged in or believes in the philosophy of environmentalism or one of the related philosophies.

Ng Cho-nam, SBS, JP, was a Hong Kong environmental studies scholar and conservationist who taught as an associate professor within the Department of Geography at the University of Hong Kong. He served as a top advisor on numerous Hong Kong government committees in areas of conservation, sustainable development, environmental protection, urban planning, and was an active member in various environmental NGOs. He was the director of the Conservancy Association from 2000 to 2019.