San Ignacio Miní, Jesuit ruins of San Ignacio, Argentina

San Ignacio Miní is a Jesuit mission ruin in San Ignacio, Misiones, Argentina. Its church, designed by Italian priest Juan Brasanelli, measures 74 metres long and 24 metres wide, with walls about 2 metres thick built of local red sandstone. Around the central plaza stand the cabildo, cemetery, monastery and houses; the church facade has columns and a broken stepped top.

Founded around 1610 by Jesuits José Cataldino and Simón Maceta in the Guayrá region, today in Paraná State, Brazil, the mission was repeatedly attacked by Paulista bandeirantes. It moved in 1632 and was definitively reestablished at its present site in 1696. Named Miní ("lesser" in Guaraní) to distinguish it from San Ignacio Guazú in Paraguay, it was destroyed by Paraguayan troops in 1817.

The mission's name distinguishes it from San Ignacio Guazú in Paraguay: Miní means "lesser" in Guaraní. The church, 74 m long and 24 m wide, was designed by Italian priest Juan Brasanelli. The site was rediscovered under dense vegetation in 1897, and poet Leopoldo Lugones's 1903 visit drew wider attention.

The ruins lie about 60 km north of Posadas, near the town of San Ignacio. The site has a museum, the Museo Jesuítico de San Ignacio Miní, and an interpretation centre. The eastern portal was restored with funding from American Express after the site was listed in the 1996 World Monuments Watch.

The church, 74 metres long and 24 metres wide, was designed by Italian priest Juan Brasanelli. Its walls are about 2 metres thick, which is why the red sandstone blocks have stayed upright for more than two centuries.