The Roman Catholic Diocese of Cochin (Latin: Dioecesis Coccinensis) is a diocese located in the city of Cochin in the Ecclesiastical province of Verapoly in India. The territory of the diocese of Cochin covers 235 square kilometers in the state of Kerala. It is situated between the Arabian Sea in the west, the Archdiocese of Verapoly in the north and in the east, and the Diocese of Alleppey in the south.