Maio or MAIO can refer to:
Places Maio, Cape Verde, an island Battle of Maio, fought between British and French naval forces in 1814 Vila do Maio, the main urban settlement on the island Maio, Guinea-Bissau, one of the Bissagos Islands Maio River, in Chile's Santiago Metropolitan Region
People Maio of Bari (died 1160), Sicilian admiral and statesman Giovan Tomaso di Maio (c. 1490–after 1548), Italian composer Giuseppe de Majo or di Maio (1697–1771), Italian composer and organist José Rodrigues Maio (1817–1884), Portuguese lifeguard and fisherman Luigi Di Maio (born 1986), Italian politician Marcello Maio, Australian jazz pianist and composer Paolo de Maio (1703–1784), Italian painter Roberto Di Maio (born 1982), Italian footballer Sebastian De Maio (born 1987), Italian-French footballer Vincent Di Maio, American pathologist
MAIO Mobile Allocation Index Offset, in GSM MAIO, an architectural office based in Barcelona, Spain, cofounded by Anna Puigjaner et al