Ambarijeby or Ambarijeby Sud is a town and commune (Malagasy: kaominina) in Madagascar. It belongs to the district of Analalava, which is a part of Sofia Region. The population of the commune was estimated to be approximately 5,000 in 2001 commune census.

Only primary schooling is available. The majority 70% of the population of the commune are farmers, while an additional 10% receives their livelihood from raising livestock. The most important crop is rice, while other important products are sugarcane, maize and cassava. Services provide employment for 3% of the population. Additionally fishing employs 17% of the population.

14°56′S 47°42′E / 14.933°S 47.700°E / -14.933; 47.700