Theano of Crotone (; ; fl. 6th-century BC) is the name given to perhaps two Pythagorean philosophers. She has been called the pupil, daughter or wife of Pythagoras, although others made her the wife of Brontinus. Her place of birth and the identity of her father are just as uncertain, there is some uncertainty if Theano can be the daughter of Brontinus the Orphic, it is still misleading but many sources are explaining that Brontinus might be the best chance to be the father of Theano, even though other made her the wife of Brontinus, leading some authors to suggest that there was more than one person whose details have become merged (these are sometimes referred to as Theano I and Theano II). A few fragments and letters ascribed to her have survived which are of uncertain authorship.