The Roman Catholic Diocese of Oyo (Latin: Oyoën(sis)) is a Latin suffragan diocese in the ecclesiastical province of Ibadan, Nigeria.

It still depends on the missionary Roman Congregation for the Evangelization of Peoples.

On January 18, 1963 it was promoted to the Diocese of Oyo, with the Archdiocese of Ibadan as its Metropolitan.

[2] In 2014, it pastorally served 36,542 Roman Catholics (1.7% of the population) in a 18,000 km2 (6,900 sq mi) area, mostly Muslim.

This article about a Roman Catholic diocese in Nigeria is a stub.