Timaeus is one of Plato's dialogues, mostly in the form of a long monologue given by the titular character, written circa 360 BC. The work puts forward speculation on the nature of the physical world and human beings and is followed by the dialogue Critias.

Plato (428/427 or 424/423 – 348/347 BCE) was a philosopher, as well as mathematician, in Classical Greece. He is considered an essential figure in the development of philosophy, especially the Western tradition, and he founded the Academy in Athens, the first institution of higher learning in the Western world. Along with his teacher Socrates and his most famous student, Aristotle, Plato laid the foundations of Western philosophy and science.