Hans Lietzmann (2 March 1875 – 25 June 1942) was a German Protestant theologian and church historian who was a native of Düsseldorf.

He initially studied in Jena, then continued his education in Bonn, where he was a student of Hermann Usener.

During his career he obtained an honorary doctorate from the University of Athens, and in 1927 became a member of the Prussian Academy of Sciences.

Largely known for his work as a church historian and for his research of the New Testament, Lietzmann was also an authority in the fields of archaeology, classical philology and papyrology.

Lietzmann was the author of the four volume Geschichte der Alten Kirche (History of the Early Church) and Messe und Herrenmahl (Mass and Lord's Supper); both works later being translated and published in English.