Theodor Weimer (born 21 December 1959 in Wertheim am Main) is a German manager who served as CEO of Deutsche Börse AG from 2018 to 2024.

Weimer started his professional career directly after his dissertation in 1988 at McKinsey & Company as a management consultant in the Düsseldorf office (Germany).

In 1995, he moved to the competitor Bain & Company, Inc. in Munich (Germany), where he became a director (senior partner) and was appointed to the Global Management Committee in Boston (US).

In April 2008, the bank appointed him spokesman designate of the Board of Managing Directors of Bayerische Hypo- und Vereinsbank AG.

[7] During his time in office, he sought a series of smaller acquisitions, succeeding in buying Danish investment management software company SimCorp and Institutional Shareholder Services but failing in an approach for Borsa Italiana.