Marianao, city, western Cuba, in City of Havana Province, near Havana. It is primarily residential and contains a military base, fine beaches, and several manufacturing industries. Products include beer, fruit preserves, brick and tile, cement, and rubber products; sugar plantations are nearby. The main growth of the community, which was settled in the early 18th century, dates from the 19th century. It was an amusement and gaming center until the late 1950s. Population (1989 estimate) 133,016.