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Pieter Winsemius (born 7 March 1942) is a retired Dutch politician of the People's Party for Freedom and Democracy (VVD) and businessman.
Winsemius worked as a researcher at the Leiden University from February 1966 until October 1970 and as a management consultant at the McKinsey & Company from October 1970 until November 1982. After the election of 1982 Winsemius was appointed as Minister of Housing, Spatial Planning and the Environment in the Cabinet Lubbers I, taking office on 4 November 1982. After the election of 1986 Winsemius was not given a ministerial post in the new cabinet. The Cabinet Lubbers I was replaced by the Cabinet Lubbers II on 14 July 1986.
Winsemius semi-retired from active politics and returned to the private sector and the public sector and occupied numerous seats as a corporate director and nonprofit director on several board of directors and supervisory boards (World Wide Fund for Nature, Vereniging Natuurmonumenten, Stichting Max Havelaar, European Centre for Nature Conservation, Stichting Pensioenfonds ABP and the Energy Research Centre) and served on several state commissions and councils on behalf of the government (Organisation for Scientific Research, National Insurance Bank, Staatsbosbeheer, Meteorological Institute and the Scientific Council for Government Policy). Winsemius also returned as a senior management consultant of the McKinsey & Company from August 1986 until October 1992 and served as a distinguished professor of Environmental management at the Tilburg University from 1 October 1999 until 1 September 2012. Winsemius was appointed again as Minister of Housing, Spatial Planning and the Environment in the caretaker Cabinet Balkenende III following the resignation of Sybilla Dekker, taking office on 26 September 2006. The Cabinet Balkenende III was replaced by the Cabinet Balkenende IV on 22 February 2007.
Following the end of his active political career, Winsemius again returned to the private sector and the public sector and resumed his previous positions (Vereniging Natuurmonumenten, Energy Research Centre, Stichting Pensioenfonds ABP and the Scientific Council for Government Policy) and as an advocate, lobbyist and activist for Conservation, Environmentalism, Sustainable development and Climate change issues.