Willem "Wim" Kok (Dutch pronunciation: [ˈʋɪm ˈkɔk] (listen); 29 September 1938 – 20 October 2018) was a Dutch politician and trade union leader who served as Prime Minister of the Netherlands from 22 August 1994 until 22 July 2002. He was a member of the Labour Party (PvdA).

Kok studied business administration at the Nyenrode Business School obtaining a Bachelor of Business Administration degree and worked as a trade union leader for the Trade Unions Association from 1961 until 1976 and serving as chairman from 1972. In 1976 it merged to form the Federation of Dutch Trade Unions, with Kok serving as its first chairman until 1986. After the election of 1986, Kok was elected as a Member of the House of Representatives, taking office on 3 June 1986. Shortly after the election incumbent Leader Joop den Uyl announced he was stepping down and endorsed Kok as his successor taking office on 21 July 1986. For the election of 1989, Kok served as Lijsttrekker (top candidate) and made a coalition accord with incumbent Prime Minister Ruud Lubbers of the Christian Democratic Appeal (CDA) which formed the Cabinet Lubbers III and became deputy prime minister and minister of finance taking office on 7 November 1989.

For the election of 1994, Kok again served as Lijsttrekker and following a cabinet formation, formed the Cabinet Kok I and became Prime Minister of the Netherlands taking office on 22 August 1994. For the election of 1998 Kok once more served as Lijsttrekker and after another successful cabinet formation, formed the Cabinet Kok II and continued as prime minister for a second term. In December 2001, Kok announced he was stepping down as Leader and that he would not stand for the election of 2002 or serve another term as prime minister. Kok left office following the installation of the Cabinet Balkenende I on 22 July 2002.

Kok retired from active politics at 63 and became active in the private and public sectors as a corporate and non-profit director, served on several state commissions and councils on behalf of the government, and continued to be active as a lobbyist for the European Union, advocating for more European integration. Kok was known for his abilities as a manager and negotiator. During his premiership, his cabinets were responsible for several major social reforms legalizing same-sex marriage, euthanasia and further reducing the deficit. Kok was granted the honorary title of Minister of State on 11 April 2003 and continued to comment on political affairs as a statesman until his death at the age of 80. He holds the distinction of leading the first purple coalitions as Prime Minister and is consistently ranked both by scholars and the public as one of the best prime ministers after World War II.