Cataloging is complete for 1,042 Greek manuscripts from the Österreichische Nationalbibliothek (Austrian National Library), microfilmed by HMML decades ago and now added to Reading Room as updated catalog records. These manuscripts are divided into shelfmark classes related to philosophy (Phil. gr.), theology (Theol. gr.), history (Hist. gr.), medicine (Med. gr.), and law (Jur. gr.), with a supplement (Suppl. gr.) consisting of more recent acquisitions.

Contents range from foundational ancient authors like Homer, Plato, and Aristotle to early modern apologetic texts, 19th-century hymnals, and other examples of later Greek literature. The oldest dated manuscript in the collection is Phil. gr. 314 (microfilm 21417), copied by Iōannēs Grammatikos in 925 CE, which includes introductory texts on the philosophical schools of Plato and Pythagoras along with Greek works by Thāwudhūrus Abū Qurrah, better known as one of the earliest Christian authors to write in Arabic, who died only a century before the manuscript was produced. Undertexts in palimpsest manuscripts likely date from much earlier, while Suppl. gr. 119 (microfilm 21588) is a false palimpsest produced by Kōnstantinos Simōnidēs, now one of the more notorious manuscript forgers of the 19th century. Theol. gr. 154 (microfilm 21774), an 11th-century copy of the four Gospels, includes elaborate canon tables and lavish full-page portraits of the Evangelists, while Phil. gr. 75 (microfilm 21138) is a 1445 copy of seven works by Aristotle that includes a relevant and sometimes humorous decorated initial for each text.

Med. gr. 1 (microfilm SEP ONB 00003), also known as the Vienna Dioscorides, is one of the most well-known manuscripts in the world, including the Peri hylēs iatrikēs (De materia medica) of the 1st-century author Dioscorides Pedanius along with several other medical, botanical, and zoological works. Illustrated with detailed images of medicinal plants on almost every page, it was copied in early 6th-century Constantinople for a Roman princess named Anicia Juliana and includes a portrait of the princess on fol. 6v that is the oldest known extant dedicatory portrait in any manuscript. It remained in Constantinople for a millennium, acquiring marginal notes in Greek, Latin, Arabic, and Hebrew along the way, before passing to Austria in the 16th century. This collection is the first large corpus of Greek material to be added to HMML's Reading Room and has greatly enriched the information available on Greek literature in the HMML Authority File database. View now