Mathias Middelberg (born 14 December 1964) is a German lawyer and politician of the Christian Democratic Union (CDU) who has been serving as a member of the Bundestag from the state of Lower Saxony since 2009.

From 1997 until 2000, Middelberg served as chief of staff to the State Minister for Economic Affairs of Bremen, Josef Hattig.

In the negotiations to form a coalition government under the leadership of Chancellor Angela Merkel following the 2017 federal elections, Middelberg was part of the working group on economic policy, led Thomas Strobl, Alexander Dobrindt and Brigitte Zypries.

[3] On behalf of his parliamentary group, Middelberg led negotiations with cabinet members Christian Lindner, Christine Lambrecht and Annalena Baerbock in May 2022 on securing a two-thirds majority in parliament needed to change Germany's constitution to allow for a credit-based special defense fund of 100 billion euros ($107.35 billion) proposed after Russia's invasion of Ukraine.

[4] In June 2017, Middelberg voted against his parliamentary group's majority and in favor of Germany's introduction of same-sex marriage.