Aristo or Ariston (from Greek: Ἀρίστων) may refer to:
- As an Ancient Greek name:
- Ariston of Sparta (6th century BC), Eurypontid King of Sparta
- Ariston of Athens (died circa 424 BC), father of Plato
- Aristo of Ceos (3rd century BC), Peripatetic philosopher
- Aristo of Chios (3rd century BCE), Stoic philosopher and colleague of Zeno of Citium
- Ariston of Paionia (3rd century BC), King of Paionia
- Aristo of Alexandria (1st century), Peripatetic philosopher
- Aristo of Pella (2nd century), Jewish Christian writer
- Ariston (hero), the protagonist of the 1967 historical novel Goat Song
- Ariston (actor), actor at the Susa weddings
- Modern persons with the name Ariston:
- Jose Ariston Caslib (21st century), current manager of the Philippine national football team
- Other usages of "Aristo":
- Aristo (ruler), a member of the ruling class in Eubian society in Saga of the Skolian Empire
- Ariston, a brand of domestic electrical appliances manufactured by Indesit.
- Ariston organette, metal disc with punched holes (late 1800s) — utilized on several music boxes
- OZ Aristo, wheels that come on some versions of the Volkswagen Golf
- Toyota Aristo, sold as the Lexus GS, outside the Japanese domestic market