Mahasoa is a town and commune in Madagascar. It belongs to the district of Ihosy, which is a part of Ihorombe Region. The population of the commune was estimated to be approximately 3,000 in 2001 commune census.
Primary and junior level secondary education are available in town. The majority 98% of the population of the commune are farmers. The most important crop is rice, while other important products are peanuts, maize and cassava. Additionally fishing employs 2% of the population.