August Leidl (19 January 1933 in Burghausen, Germany - 23 July 1994) was a Passau church historian and university professor.
In October 1968, he took over the chair of church history at the Philosophical-Theological University of Passau, and was appointed professor the following year.
In 1969, Leidl was first appointed jointly with Benno Hubensteiner, director of the Institute for East Bavarian Home Research.
In 1969, too, he was entrusted with the management of the Episcopal Archives, whose resettlement from the residence to the Luragogasse, and thus its modernization, he was able to advance.
August Leidl died on 23 July 1994 at the age of 61 and is buried in Schalding on the right bank of the Danube.