Strato of Lampsacus was a Greek philosopher of the 3rd century BCE. He was the third head of the Peripatetic school in Athens, succeeding Theophrastus and leading the school for about eighteen years until his death around 269 BCE. Before this role, he was a tutor to Ptolemy II Philadelphus in Alexandria. He was known by the nickname "the Physicist" for his primary focus on natural philosophy.

He was a prolific writer, but none of his works survive intact. They are known only through fragments and reports by later ancient authors. His lost treatises covered a wide range of scientific topics, including On the Void, On Nature, On Motion, On the Soul, and On Animals.

Strato is historically significant for developing a more rigorously naturalistic and mechanistic approach within the Peripatetic tradition. He often departed from Aristotle's teachings. According to modern scholars, his theory of motion argued that all bodies have weight and fall downward, rejecting Aristotle's concept of natural places. In psychology, he proposed a materialist view of the soul, locating its command center in the head and attributing all thought to a single faculty of intellect. His work emphasized physical explanations over divine causes, marking a distinct phase in Hellenistic thought.