阿格西莱二世（ Άγησιλαος Β，前444年?－前360年），欧里庞提德世系的斯巴达国王（约前400年—前360年在位）。阿希达穆斯二世之子，在其同父异母的兄弟亚基斯二世死后继承王位。

阿格西莱二世即位后，获得对在小亚细亚的希腊军队的领导权。他指挥这些军队防御波斯人，后者一直企图征服在亚洲的希腊殖民城邦。前396年—前394年，他在与波斯人的战斗中取得了一系列胜利。但由于斯巴达在科林斯战争（前395年—前387年）中屡屡受挫，阿格西莱二世被召回斯巴达，以帮助抵御由雅典、底比斯、阿尔戈斯和科林斯组成的反斯巴达联盟。阿格西莱二世在前394年发生于彼奥提亚地区的喀罗尼亚战役中获胜。他继续领导斯巴达军队与其它希腊城邦、尤其是日益强盛的底比斯作战；到前386年缔结安塔尔基德和约结束科林斯战争时，阿格西莱二世几乎恢复了斯巴达在希腊的霸权。但是在前371年，由亚基亚德世系的克里昂布鲁图斯一世（他是阿格西莱二世的共同在位者）率领的斯巴达军队在留克特拉战役中被底比斯统帅埃帕米农德击败，克里昂布鲁图斯一世本人阵亡。这次失败造成的损失削弱了阿格西莱二世进行新的战役的能力。

Agesilaus II (/əˌdʒɛsəˈleɪəs/; Greek: Ἀγησίλαος Agesilaos; c. 444 – c. 360 BC), was a Eurypontid king of the Ancient Greek city-state of Sparta, ruling from approximately 400 BC to 360 BC, during most of which time he was, in Plutarch's words, "as good as thought commander and king of all Greece," and was for the whole of it greatly identified with his country's deeds and fortunes. Small in stature and lame from birth, Agesilaus became ruler somewhat unexpectedly in his mid-forties. His reign saw successful military incursions into various states in Asia Minor, as well as successes in the Corinthian War; although several diplomatic decisions resulted in Sparta becoming increasingly isolated prior to his death at the age of 84 in Cyrenaica.