Marianao is one of the 15 municipalities or boroughs in the city of Havana, Cuba. It lies 6 miles southwest of the original city of Havana, with which it is connected by the Marianao railway. In 2022 the municipality had a population of 134,057. Marianao is on a range of hills of about 1500 above sea level and is noted for its salubrious climate. The city dates back to 1830.

Oriental Park Racetrack in Marianao, Havana, Cuba, was a thoroughbred horse-racing facility operated during the winter by the Havana-American Jockey Club of Cuba. Founded in 1915, Oriental Park was the only race track in Cuba before Fidel Castro came to power in 1959. It was closed February 5th, 1967.