Yapeyú is a town in the province of Corrientes, Argentina, in the San Martín Department.

It has about 2,000 inhabitants as per the 2001 census [INDEC], and it is known throughout the country because it was the birthplace of General José de San Martín (1778–1850), hero of the War of Independence.

The word Yapeyú comes from the Guaraní language and means "ripe fruit"; in other times, it was also the name of the river that is called today Guaviraví.

Presbyter Eduardo J. Maldonado considers it a combination of the guaraní words "Yaye" ("The place where") and "Peyú" ("blowing of the wind").

The town was later rebuilt, and the ruins of the little fortress, which by the end of the 18th century had been the home of Lt. Juan de San Martín and his wife, Gregoria Matorras, were preserved.