Nicomedes

Nicomedes may refer to:
 * Nicomedes (mathematician), ancient Greek mathematician who discovered the conchoid
 * Nicomedes of Sparta, regent during the youth of King Pleistoanax, commanded the Spartan army at the Battle of Tanagra (457 BC)
 * Saint Nicomedes, Martyr of unknown era, whose feast is observed 15 September

Four kings of Bithynia in Anatolia, 3rd–1st century BC:
 * Nicomedes I of Bithynia, ruled 278–255 BC
 * Nicomedes II of Bithynia, 149–127 BC
 * Nicomedes III of Bithynia, 127–94 BC
 * Nicomedes IV of Bithynia, 94–74 BC