Matthias Miersch (born 19 December 1968) is a German criminal defense lawyer and politician of the Social Democratic Party (SPD) who has been serving as Member of the German Parliament since 2005, representing the Hannover-Land II district. He focusses on environmental policy. Since 2013, Miersch has been a member of the party's executive board under successive chairpersons Sigmar Gabriel (2013-2017), Martin Schulz (2017-2018), Andrea Nahles (2018-2019) and Rolf Mützenich (since 2019).