Gaeta (Italian: [ɡaˈeːta]; Latin: Cāiēta; Southern Laziale: Gaieta) is a seaside resort in the province of Latina in Lazio, Italy. Set on a promontory stretching towards the Gulf of Gaeta, it is 133 kilometres (83 miles) from Rome and 96.5 kilometres (60 miles) from Naples.

The city has played a conspicuous part in military history; its walls date to Roman times and were extended and strengthened in the 15th century, especially throughout the history of the Kingdom of Naples (later the Kingdom of the Two Sicilies).

Present-day Gaeta is a fishing port and a renowned seaside resort. NATO has a naval base here. In 2025, it received the blue and green flags from FEE for the twelfth consecutive year. It is one of the I Borghi più belli d'Italia ("The most beautiful villages of Italy").