Aart Jan de Geus (born 28 July 1955 in Doorn) is chairman of the board of the Bertelsmann Foundation. Previously, he was deputy secretary-general of the Organisation for Economic Co-operation and Development (OECD) in Paris. He is a CDA Dutch politician and was the Minister of Social Affairs and Employment of the Netherlands in the first, second and third cabinet Balkenende.
De Geus received his propaedeuse in accounting in 1975. He then studied Dutch law at the Erasmus University, followed by postdoctoral studies at the Catholic University of Nijmegen.
From 1980, de Geus worked for the Federation of Christian Trade Unions (CNV). In 1993 he became a vice-chairman, with a portfolio including social security, pensions, public health and public works. In this capacity he also became a member of the Dutch Social-Economic Council. In 1998, he was made a partner in the consulting firm Boer & Croon.
On 22 July 2002 de Geus became Minister of Social Affairs and Employment in the Balkenende I cabinet. On 16 October he took over the Ministry of Health, Welfare and Sport. He was renamed Minister of Social Affairs and Employment in the Balkenende II Cabinet.