Abraham ben David Caslari was a Catalan-Jewish physician. He lived at Besalú, Catalonia, in the first half of the fourteenth century. Caslari was considered one of the most skillful physicians of his time. He was the teacher of Moses Narboni of Perpignan, and one of the ten notables to whom, in 1323, Kalonymus ben Kalonymus of Arles addressed his treatise on morals, entitled, Eben Bochan (Touchstone).