阿那克西美尼（希腊语：Ἀναξιμήνης，约前570年－前526年），古希腊哲学家、米利都学派的第三位学者，是阿那克西曼德的学生。他继承了前两位米利都学派哲学家的传统，也是该学派最后一位哲学家。

阿那克西美尼认为，气体是万物之源，不同形式的物质是通过气体聚和散的过程产生的，并认为火是最精纯的空气。

Anaximenes of Miletus (/ˌænækˈsɪməˌniːz/; Greek:Ἀναξιμένης; c. 585 – c. 528 BCE) was an Ancient Greek Pre-Socratic philosopher active in the latter half of the 6th century BC. One of the three Milesian philosophers, he is identified as a younger friend or student of Anaximander. Anaximenes, like others in his school of thought, practiced material monism. This tendency to identify one specific underlying reality made up of a material thing is what Anaximenes is principally known for today.