Otto Eißfeldt, spelled alternatively Otto Eissfeldt, (September 1, 1887, in Northeim – April 23, 1973, in Halle) was a German Protestant theologian, known for his work on the Old Testament and comparative near-east religious history.
His magisterial 860-page The Old Testament: An Introduction (1934, 1965), giving a detailed literary-critical assessment of the history of the formation of each part of the Old Testament on the basis of the documentary hypothesis, has been called the "best of its kind".