Aristides of Miletus was a Hellenistic author of the 2nd or 1st century BCE. He is known solely as the writer of the Milesiaka. His epithet indicates his origin from Miletus in Ionia, and no further biographical details survive.

His only known work is the Milesiaka, a collection of short, erotic prose narratives. The original Greek text is lost, preserved only through fragments, summaries, and later references.

Aristides is significant as the originator of the "Milesian tale," a genre of salacious and often comic erotic fiction in prose. His work was translated into Latin in the early 1st century BCE and profoundly influenced later Roman narrative literature, including the works of Petronius and Apuleius. Apuleius explicitly framed his Metamorphoses as a tale in this tradition. The Milesiaka thus represents a foundational, if fragmentary, stage in the development of the ancient novel.