The Roman Catholic Diocese of Alappuzha (Latin: Alleppeyen(sis)) is a diocese centered on the city of Alappuzha in the ecclesiastical province of Thiruvananthapuram in India.

It lies along the Arabian Sea between the dioceses of Kochi and Kollam, covering an area of 333 square kilometers.

[1] The Episcopal see is the Bishop's House which is located near the Alappuzha Beach.

The cathedral church of Alleppey is the Our Lady of Mount Carmel Cathedral located at Convent Square, Alappuzha.

[3] More than ten thousands of alumni's are working in different parts of the world from this organization which was firmly established by Reynolds Purackal and Former Bishop Michael Arattukulam.