The Roman Catholic Archdiocese of São Luís do Maranhão (Latin: Archidioecesis Sancti Ludovici in Maragnano) is a Latin archdiocese in Brazil.

Its cathedral is a World Heritage Site (Minor): Catedral Metropolitana Nossa Senhora da Vitória Catedral Metropolitana Nossa Senhora da Vitória.

It is located in the city of São Luís do Maranhão.

(all Roman Rite) Its ecclesiastical province comprises the Metropolitan's own archdiocese and the following Suffragan dioceses: