Carl Oscar Collett (2 February 1922 – 21 May 2008) was a Norwegian businessperson and politician for the Conservative Party.
He was born in Kristiania as a son of forester Oscar Collett (1877–1950) and Maria Iversen.
He graduated from the National Forestry Academy in Steinkjer in 1943, and took the MBA at Harvard Business School in 1949.
He was a board member from 1954, and from 1963 to 1971 he owned the company together with Albert P. Collett and manager Andreas Ebbing.
He was a working committee member of the employers' association Skogbrukets Arbeidsgiverforening from 1960 to 1970, chairing the organization from 1965 to 1969.