Tarja Cronberg (née Mattila; born 29 June 1943 in Helsinki) is a Finnish Green League politician who served as a member of the European Parliament from 2011 until 2014.

[1] Tarja Cronberg became MEP in 2011 by replacing Heidi Hautala who became Minister of International Development in the Finnish cabinet.

She chaired the Green League party from 2005 to 2009 and served on several parliamentary committees (foreign affairs, security and defence, employment).

Her research has concentrated on technology and the social sciences policy as an associate professorship at the Technical University of Denmark, among others.

Her work led to the establishment of Euregio Karelia, a cross-border region with common development programmes and projects.

Here the approach is one of the sociology of technology and the main thread is the distribution of the rights and responsibilities between the nuclear and non-nuclear states.

In addition to her native Finnish, Cronberg is fluent in Danish, English, French, German, Russian and Swedish.