Nilus Cabasilas ((Greek) Νεῖλος Καβάσιλας) was a fourteenth-century Bishop of Thessalonika, uncle of notable Palamite theologian Nicholas Cabasilas, and teacher of Byzantine theologian and statesman Demetrius Cydones. Demetrius described him as "passionately enthusiastic" about Thomism, which made Cabasilas an anomaly in that he also vigorously defended Palamism and attacked the western interpolation of the Nicene Creed.
He succeeded Gregory Palamas as Archbishop of Thessalonika.
- John Meyendorff. Byzantine Theology: Historical Trends and Doctrinal Themes. New York: Fordham University Press, 1974. p.107.