The Diocese of Sendai (Latin: Dioecesis Sendaiensis, Japanese: カトリック仙台教区) is a Latin Church diocese of the Catholic Church centered in the city of Sendai.

It is within the ecclesiastical province of Archdiocese of Tokyo in Japan.

On April 17, 1891, the Roman Catholic Diocese of Hakodate was carved out of the Apostolic Vicariate of Northern Japan.

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