Denis William Anson Marshall QSO (born 23 September 1943) is a former New Zealand politician. He was an MP from 1984 to 1999, representing the National Party, and a Government Minister until 1996. His Ministerial career ended when he resigned about six months after the release of the Commission of Inquiry report into the Cave Creek Disaster, and a year after the accident itself in which 14 people died and a further four were seriously injured, and during which time he was Minister of Conservation. He had been under pressure to resign since the report's release.