阿尔库俄纽斯（希腊语：Άλκυονεύς）希腊神话中的巨人，反对奥林匹斯众神的癸干忒斯之王。与其他癸干忒斯一样，他是盖亚与乌拉诺斯的孩子。

古希腊大诗人品达在伊斯特摩斯颂歌中写到，阿尔库俄纽斯曾赶走太阳神赫利俄斯的牛群，因而得名“赶牛者”。在癸干忒斯战争中，阿尔库俄纽斯是反对众神的癸干忒斯巨灵们的领袖。阿尔库俄纽斯力大无穷且刀枪不入；后来赫剌克勒斯（前来帮助众神的人类英雄）发现阿尔库俄纽斯强大的原因是他站在属于自己的土地上战斗，于是把他挤了出去，才得以将其杀死。

关于阿尔库俄纽斯的另一种说法是，阿尔库俄纽斯企图杀死赫剌克勒斯，于是用一块巨大的石头朝英雄砸去。结果赫剌克勒斯用木槌将石块击回，阿尔库俄纽斯反而被砸死。

Alcyoneus /ælˈsaɪəˌnuːs/ (Ancient Greek: Ἀλκυονεύς, Alkuoneus) was a traditional opponent of the hero Heracles. He was usually considered to be one of the Gigantes (Giants), the offspring of Gaia born from the blood of the castrated Uranus.

According to the mythographer Apollodorus, Alcyoneus' confrontation with Heracles was part of the Gigantomachy, the cosmic battle of the Giants with the Olympian gods. In Apollodorus' account Alcyoneus and Porphyrion were the greatest of the Giants, and Alcyoneus was immortal as long as he was in his native land. When Heracles shot Alcyoneus with an arrow, Alcyoneus fell to the ground but then began to revive, so on the advice of Athena, Heracles dragged Alcyoneus out of his homeland where Alcyoneus then died.