William Colgan
- Actor
- Producer
William ("Liam") Colgan is a Canadian climate researcher affiliated with the Geological Survey of Denmark and Greenland, in Copenhagen, Denmark. He has appeared as himself in films and TV programs, giving commentary about the impact of climate change on the Greenland Ice Sheet. He is best known for his work regarding the effect of climate change on the abandoned ice-sheet military base at Camp Century, Greenland.