Timaeus of Locri (; ; ) is a character in two of Plato's dialogues, Timaeus and Critias. In both, he appears as a philosopher of the Pythagorean school. If there existed a historical Timaeus of Locri, he would have lived in the fifth century BCE, but his historicity is dubious since he only appears as a literary figure in Plato; all other ancient sources are either based on Plato or are fictional accounts.