The writings of Philo of Alexandria (20 B.C.E.-40 C.E.) are important for the light they shed on the development of both Hellenistic Judaism and early Christianity. This new reference work, designed specifically to aid with scholarly research on Philo, is the first and only available index to all the Greek words in the writings of Philo, main fragments included. This lemmatized and computer-generated concordance lists each Greek word alphabetically, then lists exhaustively every occurrence of the term within Philo's extensive body of work.