Maria Anna Klein-Schmeink (born 6 January 1958) is a German politician of Alliance 90/The Greens who has been serving as a member of the Bundestag from the state of North Rhine-Westphalia since 2009.

From 2002 until she moved to the German Bundestag in 2009, she worked as a legislative advisor to the Green Party's group in the State Parliament of North Rhine-Westphalia.

[2][3] In 2020, she succeeded Katja Dörner as one her parliamentary group's deputy chairs, under the leadership of co-chairs Katrin Göring-Eckardt and Anton Hofreiter.

[6] In the negotiations to form a coalition government under the leadership of Minister-President of North Rhine-Westphalia Hendrik Wüst following the 2022 state elections, Klein-Schmeink was part of her party’s delegation.

[7] In March 2024, Klein-Schmeink announced that she would not stand in the 2025 federal elections but instead resign from active politics by the end of the parliamentary term.