Lena Sommestad (born 3 April 1957) is a Swedish Social Democratic politician and economic historian.

She was Minister for the Environment in the Ministry of Sustainable Development in the Cabinet of Göran Persson from 2002 to 2006.

Sommestad studied social sciences at Uppsala University and received a PhD degree in 1992.

From 1998 to 2002 she was the managing director of the Swedish Institute for Futures Studies (Institutet för framtidsstudier).

[1] Between April 2014 and March 2020, she was County Governor of Halland.