This essay on the Greek versions of Tobit appears in Volume 2 of the Textual History of the Bible, edited by Armin Lange, concerning the Deuterocanonical Scriptures of the Old Testament, in particular in Vol.2C, in which the Book of Tobit is also included. According to the novelty of the methodological perspective of this work, we do not focus mainly on the most important testimonia textus, in view of the reconstruction of the original of each book, but rather we aim to examine all the known textual witnesses of each of the biblical books, paying therefore particular attention to the manuscript traditions, and considering specifically all the single linguistic traditions in which they come. This article therefore presents: 1. The Forms of the Text: Origin, Historical Data and Problems - 2. Text Editions: The Cambridge Project; The Göttingen Project - 3. The Synoptic Editions: Wagner’s Polyglotte; Weeks, Gathercole, and Stuckenbruck Synopsis - 4. History of Scholarship: The Discovery of LXXS; Text-Critical Approach - 5. The Problem of Priority between the Textual Forms: The Contribution of GIII; Comparison between GI and GII - 6. Translation Techniques: the Problem of the Semitisms - 7. The Search for the Urtext