阿基斯二世（古希腊语：Ἄγις B', 英语：Agis II），(？－前399年)，前427年—前399年在位，斯巴达埃乌吕彭家族国王，阿基达姆斯二世之子及继承人。公元前426年与公元前425年的阿基达姆斯战争中，他曾统帅伯罗奔尼撒大军。公元前418年，他与阿奇斯及其其他斯巴达的敌人开战，获得曼提内亚战役的胜利，重新确立斯巴达对伯罗奔尼撒控制。公元前413年德凯莱亚战争伊始，他即把德凯莱建成一永久基地，并在公元前405年至公元前404年与来山德一同封锁雅典。公元前402年，他入侵埃利斯。

Agis II (Greek: Ἄγις; died c. 401 BC) was the 18th Eurypontid king of Sparta, the eldest son of Archidamus II by his first wife, and half-brother of Agesilaus II. He ruled with his Agiad co-monarch Pausanias.

Agis succeeded his father Archidamus in 427 BC, and reigned a little more than 28 years. In the summer of 426 BC, he led an army of Peloponnesians and their allies as far as the isthmus, with the intention of invading Attica; but they were deterred from advancing farther by a succession of earthquakes which happened when they had got so far. In the spring of the following year he led an army into Attica, but quit it fifteen days after he had entered it. In 419 BC, the Argives, at the instigation of Alcibiades, attacked Epidaurus; and Agis with the whole force of Lacedaemon set out at the same time and marched to the frontier city, Leuctra. No one, Thucydides tells us, knew the purpose of this expedition. It was probably to make a diversion in favour of Epidaurus.