Agathodaemon of Alexandria (, Agathodaímon Alexandreùs) was a Greek or Hellenized cartographer, presumably from Alexandria, Egypt, in late Antiquity, probably in the 2nd century A.D. Agathodaemon is mentioned in some of the earliest manuscripts of Ptolemy's Geography:

"From the eight books of geography of Claudius Ptolemaeus the whole habitable world Agathodaemon of Alexandria delineated."

The line appears in the running text of the Geography and not as a caption on the maps themselves. Since the inscriptions are the only surviving reference to him and these manuscripts only survive from the very late 13th century, the most that can be stated conclusively is that he lived sometime between the years  150 and 1300, although his classical name and his epithet—"the Alexandrian"—probably places him before that city's fall to the Caliphate in 641 and not contemporary with Maximus Planudes's reconstruction of the Ptolemaic atlas after 1295.