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Lucius Aelius Stilo Praeconinus (, ; c. 154 – 74 BC), of Lanuvium, was the earliest known philologist of the Roman Republic. He came from a distinguished family and belonged to the equestrian order.

He was called Stilo (from Latin , "pen for writing on wax") because he wrote speeches for others, and Praeconinus from his father's profession (, "announcer, public crier, herald"). His aristocratic sympathies were so strong that he voluntarily accompanied Caecilius Metellus Numidicus into exile. At Rome he divided his time between teaching (although not as a professional schoolmaster) and literary work.