Gaston François Marie, Viscount Eyskens (1 April 1905 – 3 January 1988) was a Christian democratic politician and prime minister of Belgium.

During his periods in office, Eyskens was confronted with major ideological and linguistic conflicts within Belgium including the Royal Question in 1950, the School War in 1958, the independence of the Belgian Congo in 1960 and the split of the University of Leuven in 1970.

On 10 August 1931 he married Gilberte De Petter (1902–1981),[3] daughter of the Leuvener politician Emile De Petter [nl], with whom he had two sons: Erik Eyskens (Leuven, 20 July 1935 – Antwerp, 31 August 2008) and Mark Eyskens.

During the early 1930s Eyskens was chief of staff of CVP ministers Edmond Rubbens [fr] and Philip Van Isacker [nl].

His cabinet fell in June 1950 over the constitutional crisis caused by King Leopold III's actions during the Second World War.

This government fell on 25 April 1961 over the Unitary Law (which raised the fiscal pressure by 7 billion Belgian francs, cut spending in education and the military, and reformed unemployment benefits and government pensions) and had caused large-scale strikes.

Student unrest and questions of discrimination against the ethnic Flemish population brought down the Belgian government in February 1968.