Matthias Miersch 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.

The Parlamentarische Linke is a platform within the Social Democratic Party of Germany (SPD)'s Bundestag group. As of 2022, 96 of the group's 206 members belong to the Parliamentary Left, making it the largest of the three extant platforms in the SPD group, alongside the Seeheimer Kreis and Berlin Network. The Parliamentary Left represents social democratic positions within the party.