Egerton MS 88 is a late sixteenth-century Irish manuscript, now housed in the British Library Egerton Collection, London. It is the work of members of the O'Davorens (Irish: àDuibhdábhoireann), a distinguished family of lawyers in Corcomroe, County Clare, and was compiled between 1564 and 1569 under the supervision of Domhnall àDuibhdábhoireann.
The document is an important collection of medieval Irish legal texts, literature, grammatical works and legal glossaries. It contains a copy of O'Davoren's Glossary.