Capito was an Alexandrian grammarian who lived during the reign of the Roman emperor Tiberius. He is sometimes identified as Gaius Ateius Capito, though this may conflate him with a Roman jurist. Beyond his profession and era, no further biographical details are recorded.

The Byzantine encyclopedia Suda attributes to him a single, now lost, work titled On Sicily and the Cities Therein. The same source notes he wrote unspecified other works, but no fragments survive. His significance rests on his attestation as a lost author within the Hellenistic tradition of local history and geography.

As a grammarian from Alexandria, he exemplifies the continuation of Greek scholarly activity under Roman rule, though the complete loss of his work precludes assessment of his specific contributions.