Johannes Haller

{{Short description|Baltic German historian (1865–1947)}}

{{Unreferenced|date=January 2022}}

{{Infobox person

| name = Johannes Haller

| birth_date = 16 October 1865

| birth_place = Käina, Governorate of Estonia, Russian Empire

| death_date = {{death-date and age|24 December 1947|16 October 1865}}

| death_place = Tübingen

| occupation = medievalist

| spouse = Elisabeth Fueter

| children = 4

| parents = Anton Haller (1833–1905), Amalie Sacken (1838–1899)

| nationality = German

}}

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.