The Roman Catholic Archdiocese of Joinville (Latin: Archidioecesis Ioinvillensis) is the metropolitan of an ecclesiastical province in Santa Catarina, in the Southern Region of Brazil.

It was a suffragan diocese in the ecclesiastical province of Florianópolis, also in Santa Catarina, before the elevation to its current status in 2024.

Its cathedral is Catedral São Francisco Xavier, dedicated to saint Francis Xavier, in the city of Joinville.

As per 2014, it pastorally served 744,219 Catholics (65.0% of 1,144,952 total) on 9,508 km2 in 53 parishes and 5 missions with 118 priests (64 diocesan, 54 religious), 55 deacons, 228 lay religious (104 brothers, 124 sisters) and 26 seminarians.

This article on a Roman Catholic diocese in Brazil is a stub.