Neilos Kabasilas (also Nilus Cabasilas; Greek: Νεῖλος Καβάσιλας Neilos Kavasilas), was a fourteenth-century Greek Palamite theologian who succeeded St. Gregory Palamas as Metropolitan of Thessalonica (1357–1363). Neilos, who was called Nicholas as a layman, has often been confused with his nephew, the more famous Nicholas Kabasilas, best known for his Commentary on the Divine Liturgy
Neilos was a teacher of the famed translator of Thomas Aquinas into Greek, Demetrios Kydones. As a theologian, his most important works are a Theological Rule in defense of the essence-energies distinction and a series of discourses against the Filioque (the Latin teaching on the procession of the Holy Spirit).
- Kaffa, Elena (2014-06-26). The Greek Church of Cyprus, the Morea and Constantinople during the Frankish Era (1196-1303): A New Perspective. Cambridge Scholars Publishing. p. 78. ISBN 978-1-4438-6299-8.
- Théophile Kislas (Éd.), Nil Cabasilas, Sur le Saint-Esprit. Introduction, texte critique, traduction et notes (Paris, 2001).
- Manuel Candal, Nilus Cabasilas et theologia S. Thomae. De Processione Spiritus sancti (Rome, 1945).