The Apostolic Vicariate (originally Apostolic Prefecture) of Micronesia was a 19th-century Roman Catholic missionary pre-diocesan jurisdiction in Micronesia (Oceania).
On 15 May 1886, it lost territory to establish the Mission sui juris of Eastern Carolines and the Mission sui juris of Western Carolines.
In 1887 it was promoted to Apostolic Vicariate (entitled to a titular bishop) of Micronesia.
It remained exempt, i.e. directly subject to the Holy see, not part of any ecclesiastical province.
This article on a Roman Catholic diocese in Oceania is a stub.