Lars Gösta Rehn (1913 - 1 December 1996) was a Swedish economist.
He studied at the and its ”Social Research Institute” (Socialinstitutet). He started to work as an economist for the Swedish Trade Union Confederation in 1930, being this his full-time employment since 1943. From 1973 to his retirement, he was professor of labour market policy at the Institute of Social Research.
Together with Rudolf Meidner, he developed the Rehn-Meidner Model, a staple of the economic and social "Swedish Model"