Jens Böhrnsen (born 12 June 1949) is a German politician of the SPD who served as President of the Senate and Mayor of Bremen from 2005 to 2015.

As such, he was acting head of state of Germany from the resignation of President Horst Köhler on 31 May 2010 until the election of Christian Wulff on 30 June 2010.

Böhrnsen was born on 12 June 1949 in Gröpelingen, then a workers' district of Bremen, to parents active in the Social Democratic Party of Germany (SPD) and labor unions.

[1] When Horst Köhler resigned from the presidency on 31 May 2010, Böhrnsen assumed the functions of head of state of Germany until the election of a successor by a Federal Convention.

After his party lost more than five percentage points in the state election on 10 May 2015, Böhrnsen retired as head of government.