Marianao is one of the 15 municipalities or boroughs (municipios in Spanish) 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.

As Havana expanded during the 1930s and 1940s, Marianao became a suburb of the city.

A famous landmark is the monument built to honor Carlos Juan Finlay, a doctor who helped eradicate yellow fever in Cuba in the 19th century. It is shaped like a syringe. The monument is at the junction of Calles 100 and 31, close to several major hospitals.

Marianao is home to the famous Tropicana Club and was home to the Oriental Park Racetrack. One of the most notable foods made in Marianao is "Pollo A La Barbacoa".

• Alicia Alonso, prima ballerina assoluta
• Camilo Marin, jockey agent
• Maria Teresa, Grand Duchess of Luxembourg, spouse of the current Grand Duke of Luxembourg
• Jorge Enrique González Pacheco, poet and cultural entrepreneur
• Luis Tiant, baseball player

• Carmen (Campeche, Mexico)
• Zapopan (Jalisco, Mexico)

•  This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Marianao". Encyclopædia Britannica (11th ed.). Cambridge University Press.

• Details of municipality (Spanish)
• El Obelisco de Marianao
• Description of Marianao before the 1959 Revolution