Maniace (Sicilian: Maniaci) is a comune (municipality) in the Province of Catania in the Italian region Sicily, located about 130 km east of Palermo and about 45 km northwest of Catania. As of 31 December 2004, it had a population of 3,606 and an area of 35.9 km².

The municipality bears the name of George Maniakes (Greek: Γεώργιος Μανιάκης; Italian: Giorgio Maniace), a prominent general of the 11th century and catepan of Italy, known for his victories against the Arabs in Sicily.

Maniace borders the following municipalities: Bronte, Cesarò, Longi.

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The Castello Maniace is a citadel and castle in Syracuse, Sicily. It stands on a large promontory, where it was constructed between 1232 and 1240 by the Emperor Frederick II. It bears the name of George Maniakes, the Byzantine general who besieged and took the city in 1038. Originally, one could only enter the castle over a bridge spanning a moat (now filled). A notable feature of the castle is the decorated portal.

Today the castle is open to public and is a local tourist attraction in Syracuse. Still, the castle has become run down since the Bridport family left in 1982.

The first fort was built here in 1038 by George Maniakes, a Greek general and later the catepan of Italy, after his capture of Syracuse from Arabic rule, on behalf of the Emperor Michael IV. Frederick II, as King of Sicily, had his architect Riccardo da Lentini rebuild it in 1232-1240. King Peter III of Aragon resided here with his family in 1288. From 1305 to 1536 the castle was used as residence by numerous queens of Sicily.