This volume, the twenty-sixth year of published proceedings, contains seven papers and commentaries presented to the Boston Area Colloquium in Ancient Philosophy during academic year 2009-10. The papers treat topics including: nature and reason in Parmenides, psychology and immortality in Plato's Phaedo and psychic motion in Plato's Laws, various issues in Aristotle, the relation of form and definition in Metaphysics Z, cosmic orientation (turning right) in De Caelo, and the complex function of phantasia in De Anima, and finally Themistius' account of the nature of soul and intellect, Aristotelian with Platonic nuances.