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Johannes Haller
Born16 October 1865
Died24 December 1947 (1947-12-25) (aged 82)
NationalityGerman
Occupationmedievalist
SpouseElisabeth Fueter
Children4
Parent(s)Anton Haller (1833–1905), Amalie Sacken (1838–1899)

Johannes Haller (16 October 1865 – 24 December 1947) was a Baltic German medievalist and teacher at the universities of Tübingen, Marburg and Giessen.

Haller was born in Käina and studied history in Tartu and at the Frederick William University in Berlin. He was expert in the field of the history of Christianity. He died in Tübingen.