Marosakoa is a town and commune in western Madagascar over the Mozambique Channel. It is approximately 35 kilometres south of Mahajanga. It belongs to the district of Marovoay, which is a part of Boeny Region. The population of the commune was estimated to be approximately 10,000 in 2001 commune census.
Only primary schooling is available. The majority 60% of the population of the commune are farmers, while an additional 34% receives their livelihood from raising livestock. The most important crop is rice, while other important products are sugarcane and cassava. Services provide employment for 1% of the population. Additionally fishing employs 5% of the population.