The Antesaka, also known as Tesaka, or Tesaki, are an ethnic group of Madagascar traditionally concentrated south of Farafangana along the south-eastern coast. They have since spread more widely throughout the island. The Antesaka form about 5% of the population of Madagascar. They have mixed African, Arab and Malayo-Indonesian ancestry, like the western coastal Sakalava people of Madagascar from whom the clan derives. They traditionally have strong marriage taboos and complex funeral rites. The Antesaka typically cultivate coffee, bananas and rice, and those along the coast engage in fishing. A large portion of the population has emigrated to other parts of the island for work, with an estimated 40% of emigrants between 1948 and 1958 permanently settling outside the Antesaka homeland.

Demographic features of the population of Madagascar include population density, ethnicity, education level, health of the populace, economic status, religious affiliations and other aspects of the population.