The Diocese of Chalan Kanoa (Latin: Diœcesis Vialembensis) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in the United States.

It comprises the territory of the Commonwealth of the Northern Mariana Islands and is a suffragan of the Metropolitan Archdiocese of Agaña.

The diocese was canonically erected on 8 November 1984 by Pope John Paul II.

Its territories were taken from the archdiocese based in Guam.

[1] The Diocese of Chalan Kanoa is led by a prelate bishop who pastors the mother church, the Our Lady of Mount Carmel Cathedral on Saipan.