Denis William Anson Marshall 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.