Tonan-in Temple is the main temple of the Shingon Sect considered to have been located to the southeast of Todai-ji Temple (which is around the present Todaiji Library).
東南院（とうなんいん）は、東大寺の東南方向（現在の東大寺図書館付近）にあったとされる真言宗の拠点寺院。