The Apostolic Prefecture of the Marshall Islands (Latin: Praefectura Apostolica Insularum Marshallensium) is a Latin Church ecclesiastical jurisdiction or apostolic prefecture of the Catholic Church in the Marshall Islands.

The apostolic prefecture is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Agaña (with its see on Guam), yet still depends on the Dicastery for Evangelization.

As of 2021[update], there were 5,123 Catholics (8.7% of the population) on 181 km2 of islands in a marine area nearly the size of the United States, served by 6 priests, 3 deacons and 6 nuns across 5 parishes.

[3] In 1905, a pre-diocesan jurisdiction was established as Mission sui juris of Marshall Islands, on territory split off from the then Apostolic Vicariate of New Pomerania (mainly New Britain, in the Bismarck Archipelago of Papua New Guinea).

On April 5, 1923, the independent mission was suppressed, its territory being merged into the then Apostolic Vicariate of Mariana, Caroline and Marshall Islands.