Lanjarivo or Langarivo is a commune (Malagasy: kaominina) in northern Madagascar. It belongs to the district of Antalaha, which is a part of Sava Region. According to 2001 census the population of Lanjarivo was 11,326.

Only primary schooling is available in town. The majority 99% of the population are farmers. The most important crop is vanilla, while other important products are coffee and cloves. Services provide employment for 1% of the population.

14°36′S 50°3′E / 14.600°S 50.050°E / -14.600; 50.050