Aristaeus the Elder (Ancient Greek: Ἀρισταῖος ὁ Πρεσβύτερος; 370 – 300 BC) was a Greek mathematician who worked on conic sections.
The mathematician Pappus of Alexandria refers to him as Aristaeus the Elder.
He may have also authored the book Concerning the Comparison of Five Regular Solids.
This book has also been lost; it is known through a reference by the Greek mathematician Hypsicles.
Heath 1921 notes, "Hypsicles (who lived in Alexandria) says also that Aristaeus, in a work entitled Comparison of the five figures, proved that the same circle circumscribes both the pentagon of the dodecahedron and the triangle of the icosahedron inscribed in the same sphere; whether this Aristaeus is the same as the Aristaeus of the Solid Loci, the elder contemporary of Euclid, we do not know.