Callao is a seaside city, port and region in the Lima metropolitan area of Peru. Callao may also refer to: Places Avenida Callao ('Callao Avenue'), Buenos Aires, Argentina Callao (Line B Buenos Aires Underground) Callao (Line D Buenos Aires Underground) Callao District, Callao Region, Peru Roman Catholic Diocese of Callao, Peru Callao Cave, Peñablanca, Cagayan province, Philippines Callao Square, Madrid, Spain Callao (Madrid Metro) Callao, Missouri, United States Callao Township, Macon County, Missouri, United States Callao, Utah, United States Callao, Virginia, United States El Callao Municipality, Bolivar State, Venezuela El Callao, Venezuela Ships , 1888–1898 , the name of several American ships Other uses "Callao" (song), by Anna Carina, 2019 Callao, a song by Wisin & Yandel from the 2018 album Los Campeones del Pueblo Pilsen Callao, a beer by Backus and Johnston Brewery National University of Callao, in Callao province, Peru See also Callao affair, 1820 Battle of Callao (1838) Battle of Callao, 1866 Blockades of Callao, several events Siege of Callao (disambiguation), several events