Robert Hanhart (born July 6, 1925) is a Swiss Protestant theologian known for his scholarship of the Septuagint, the Greek version of the Jewish scriptures.
He first worked for a year at Mittellateinisches Wörterbuch, a project to create a medieval Latin dictionary.
He then moved to the Göttingen Academy of Sciences and Humanities in Germany, where he worked as a research assistant at the Göttinger Septuaginta-Unternehmen [de].
He completed a habilitation in 1965 with his thesis being his edition of the Book of Esther; this allowed him to be appointed an adjunct professor of the Old Testament at Göttingen in 1967.
However, he continued to work in the field, writing the book Studien zur Septuaginta und zum hellenistischen Judentum in 1999 and providing forwards, commentary, and editorship for other projects.