The Roman Catholic Diocese of Fenoarivo Atsinanana (Latin: Fenoariven(sis) – Atsinananen(sis)) is a diocese located in the city of Fenoarivo Atsinanana in the ecclesiastical province of Toamasina in Madagascar.

Its cathedral episcopal see is the Cathédrale Saint Maurice, in the city of Fenoarivo Atsinanana, Toamasina Province.

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