Filiki Eteria or Society of Friends (Greek: Φιλική Εταιρεία or Εταιρεία των Φιλικών) was a secret 19th-century organization whose purpose was to overthrow the Ottoman rule of Greece and establish an independent Greek state. Society members were mainly young Phanariot Greeks from Russia and local chieftains from Greece. One of its leaders was Alexander Ypsilantis. The Society initiated the Greek War of Independence in the spring of 1821.
The direct translation of the word "Filiki" is "Friendly" and the direct translation of the word "Eteria" is "Society" (also "Company" or "Association"). The name of Filiki Eteria has been transliterated in numerous publications with combinations of Filiki, Filike, Philiki, Philike with Eteria, Etairia, Etaireia, Etereia, Hetairia.
In the context of ardent desire for independence from Turkish occupation, and with the explicit influence of similar secret societies elsewhere in Europe, three Greeks came together in 1814 in Odessa to decide the constitution for a secret organization in freemasonic fashion. Its purpose was to unite all Greeks in an armed organization to overthrow Turkish rule. The three founders were Nikolaos Skoufas from the Arta province, Emmanuil Xanthos from Patmos and Athanasios Tsakalov from Ioannina. Soon after they initiated a fourth member, Panagiotis Anagnostopoulos from Andritsaina.