Achates (disambiguation)

Achates may refer to:
 * Achates (Greek mythology)
 * Achates, name of two ships
 * Achates (river), the Sicilian river known in antiquity as the Achates
 * 5144 Achates, an asteroid
 * Agate, the gemstone called achates by Theophrastus and Pliny the Elder
 * Leonardus Achates, the fifteenth century composer from Basel
 * HMS Achates, the series of British Royal Navy ships named for after this character
 * Achates Power, an American developer of engines