Bolus of Mendes (Greek: Βῶλος ὁ Μενδήσιος, Bōlos ho Mendēsios; fl. 3rd century BC) was a philosopher, a neopythagorean writer of works of esoterica and medicine, in Ptolemaic Egypt.^[1] Both the Suda,^[2] and a later work mistakenly attributed to Eudokia Makrembolitissa—Ἰωνιά; Bed of Violets,^[3] probably a 16th-century forgery^[4] by Constantine Paleocappa—write of a Pythagorean philosopher of Mendes in Egypt. He is described as one who wrote on marvels, potent remedies, and astronomical phenomena.^[5] The Suda, however, also describes a separate Bolus who was a philosopher of the school of Democritus,^[6] who wrote Inquiry, and Medical Art, containing "natural medical remedies from some resources of nature." However, from a passage of Columella,^[7] it appears that Bolos of Mendes and this other Bolus, follower of Democritus, were one and the same person.^[5] He seems to have lived following the time of Theophrastus, whose work Historia Plantarum ('On Plants'), Bolus appears to have known.^[8]