The Roman Catholic Diocese of Geraldton is a Latin Church ecclesiastical jurisdiction or diocese of the Catholic Church covering the Mid West, Western Australia.

It is a suffragan diocese in the ecclesiastical province of the Metropolitan Archdiocese of Perth.

Established on 30 January 1898 as Diocese of Geraldton / Geraldtonen(sis) (Latin), on territory split off from the then Diocese of Perth (now its Metropolitan).

As of 2014[update], it pastorally served 29,700 Catholics (23.1% of 128,800 total) on 131,831 km² in 16 parishes and 24 missions with 18 priests (12 diocesan, 6 religious), 35 lay religious (10 brothers, 25 sisters), 3 seminarians.

The diocese has fifteen parishes with regular liturgical services held in the following locations, with churches dedicated to particular saints:[1] The following individuals have been elected as Bishops of Geraldton:[2]