Thaddeus Antonius Gerardus Maria (Geert) Reuten (Heerlen, April 16, 1946) is a Dutch politician and economist. On behalf of the Socialist Party since June 2007 he is a senator in the First Chamber (upper house) of the Dutch parliament. Reuten also teaches economics at the University of Amsterdam, and is internationally recognized as an expert on Marx and Hegel.
Reuten studied economics and sociological economics at the Erasmus University Rotterdam and at the Birkbeck College of the University of London. He graduated in 1988 at the University of Amsterdam (UvA). From 1977, he was lecturer and later professor at the UvA. From 2002 to 2014, he was director of the Master of Economics at the same university. His prominent work The Capitalist System is now also used as a text book in University of Amsterdam for advanced BSc and MSc course.
He joined in Socialist Party and since that year as the economic adviser to the party in the House. In the first election in 2007 he was elected to the Senate. He was sworn in on June 12, 2007. Reuten has also been active in the alter-association Association for the Taxation of Financial Transactions for the Aid of Citizens, ATTAC.