Ludwig Landgrebe (9 March 1902, Vienna – 14 August 1991, Cologne) was an Austrian phenomenologist and Professor of philosophy.
He is the grandfather of award-winning German actor Max Landgrebe.
After the approval of his doctoral dissertation, Landgrebe transferred to Prague for his postdoctoral qualification under Oskar Kraus.
In 1945 Landgrebe had his post-doctorate reapproved in Hamburg, and he was made ordinary professor in 1947 in Kiel, where Hans Blumenberg was one of his students.
Landgrebe is known as one of Husserl's closest associates, but also for his independent views relating to the subjects of history, religion and politics, as seen from the viewpoints of existentialist philosophy and metaphysics.