Aristocritus (Ancient Greek: Ἀριστόκριτος) is the name of several people of the ancient world. It can refer to:

• Aristocritus, the father of the Spartan general Lysander.
• Aristocritus (actor), an actor sent as an emissary from Pixodarus to offer his daughter's hand in marriage to a son of Philip II of Macedon
• Aristocritus, son of Charixenus of Argos, won the Dolichos and Diaulos in the Lycian games.
• Aristocritus, a man described in one of the speeches of Lysias as a bystander who gets hit in the head with a rock intended for the defendant in Lysias's narrative.
• Aristocritus, a writer of probably around the first century BCE who, according to Clement of Alexandria, wrote a book attacking the works of Heracleodorus.
• Aristocritus, a Greek writer who was known to have written a work about Miletus.
• Aristocritus, an otherwise unknown Athenian of the fifth century BCE whose well-preserved tombstone, describing him as having been slain by the god Ares, is a subject for study by scholars.
• Aristocritus (writer), a writer of the fifth century who wrote a work titled Theosophy.