'''Santa Maria Nagusia basilika''' ({{lang-it|Santa Maria Maggiore}}, {{lang-la|Sanctae Mariae Maioris}}) [[Erroma]]ko lau [[basilika nagusi]]etako bat da, [[Done Joan Laterangoaren basilika|San Joan Laterangoa]], [[San Petri basilika|San Petri Vatikanokoa]] eta [[San Paulo Harresiz Kanpokoa]]rekin batera. Hiriburuaren erdialdeko [[Monti (Erroma)|Monti ''rionean'']] kokaturik dago.
[[Laterango Itunak|1929ko Laterango Itunaren]] arabera, basilika italiar lurraldean dago baina jabetza [[Egoitza Santua]]ren da<ref>{{Cite weberreferentzia|url=http://www.vaticanstate.va/content/dam/vaticanstate/documenti/leggi-e-decreti/Normative-Penali-e-Amministrative/LateranTreaty.pdf|izenburua=LateranTreaty.pdf|sartze-data=|egunkaria=www.vaticanstate.va|aldizkaria=|abizena=|izena=|egile-lotura=|hizkuntza=|formatua=}}</ref>, eta lurraldez kanpoko estatusa du enbaxaden antzera<ref name='treaty'>{{cite weberreferentzia|url=http://www.vaticanstate.va/NR/rdonlyres/3F574885-EAD5-47E9-A547-C3717005E861/2528/LateranTreaty.pdf|publisher=Holy See|title=Treaty between the Holy See and Italy|quote= Article 13: "Italy recognizes the full ownership of the Holy See over the patriarchal Basilicas of St. John Lateran, Sta. Maria Maggiore, and St. Paul, with their annexed buildings. ...<br> Article 15 The properties indicated in Article 13 hereof ..., even if such edifices form part of the territory of the Italian State, will enjoy the immunities granted by International Law to the headquarters of the diplomatic agents of foreign States."}}</ref>. Bertan eman zuen bere aurreneko meza [[Ignazio Loiolakoa]]k, 1538ko abenduaren 25ean.
