Anaximenes of Miletus (/ ˌænækˈsɪməˌniːz /; Greek: Ἀναξιμένης ὁ Μιλήσιος; c. 586/585 – c. 526/525 BC) was an Ancient Greek, Pre-Socratic philosopher from Miletus in Anatolia (modern-day Turkey). He was the last of the three philosophers of the Milesian School, after Thales and Anaximander.

Anaximenes was the first Greek philosopher to form a clear distinction between planets and stars, and to provide scientific explanations to account for natural events such as thunder, lightning, rainbows, earthquakes etc.

The Greek philosopher Anaximenes (active 546 B.C.), last of the important philosophers of Miletus, was perhaps the first philosopher to insist on an underlying physical law governing the universe. The details of the life of Anaximenes are almost totally unknown, but he is said to have flourished in the year of the fall of Sardis.

Anaximenes (in Greek: Άναξιμένης) of Miletus (c. 585 – 528 B.C.E.) was a pre-Socratic Greek philosopher, the third of the philosophers of Ionia (the first being Thales and the second Anaximander). He was a citizen of Miletus and a student of Anaximander.

Anaximenes was a philosopher who was interested in the fundamental principles that govern the universe and the nature of reality. He belonged to the Milesian school of thought, which was a group of ancient Greek philosophers who were concerned with the nature of the world and the fundamental principles that underlie it.