Olli Ilmari Rehn ( pronunciation (help·info)) (born 31 March 1962) is a Finnish politician, currently serving as European Commissioner for Economic and Financial Affairs. He had previously served as Commissioner for Enlargement. He has held a variety of political positions in European institutions as well as in Finland.
Born in Mikkeli in Eastern Finland, Rehn studied economics, international relations and journalism at Macalester College, Saint Paul, Minnesota, USA. He took a master's degree in political science from the University of Helsinki in 1989, and a PhD from the University of Oxford in 1996 on the subject of "Corporatism and Industrial Competitiveness in Small European States".
Rehn also played football for his hometown club Mikkelin Palloilijat in Finland's top division Mestaruussarja (now Veikkausliiga) in his youth.