Alcyoneus (disambiguation)

Alcyoneus is a Giant, and opponent of Heracles in Greek mythology.

Alcyoneus or Alkyoneus may also refer to:
 * Alcyoneus, a character in Rick Riordan's The Heroes of Olympus novels; see list of characters in mythology novels by Rick Riordan
 * Hylaeus alcyoneus, a bee species endemic to Australia
 * Alcyoneus (Son of Diomos), a figure in Greek mythology, intended as a sacrifice to the monster Sybaris
 * Alcyoneus, a character mentioned in Quintus Smyrnaeus' epic poem Posthomerica (2.364), in which he is a member of the Ethiopian army, fighting on the side of the Trojans in the Trojan War
 * Alcyoneus, an alternate name for Ischys, the son of Elatus and Hippea, and also the lover of Coronis
 * Alcyoneus or Halcyoneus, the son of Antigonus II Gonatas
 * Alcyoneus (galaxy), an unusually large radio galaxy