Mar Mari Sleeha  church is a parish of the Chaldean Syrian Church of the East in India, an Archdiocese of the global Assyrian Church of the East. The Parish is situated at Kuriachira a suburb south to the city of Thrissur in the state of Kerala. Mar Mari Sleeha Church was consecrated on 29^th of April 1956 by the then Metropolitan of the archdiocese, Mar ThomaDharmo. Besides, Mar Mari Sleeha Church, there are two more churches in this parish. Mar Poulose Church is attached to the cemetery of the Parish  and was consecrated on 2^nd  of February, 1962  also by Mar ThomaDharmo Metropolitan. After the unification of the Church in India in 1995, Mar Oudheesho Church parish and Mar Mari sleeha Church parish got merged to form one parish. Mar Oudheesho Church was consecrated on 18^th of February, 1979 by the late Mar Thimotheus Metropolitan.

Mar Mari Sleeha Church is now celebrating its Diamond Jubilee Year. The Saint in whose name the church is dedicated , is well known to us all, as the order of Holy Qurbhana is known  as the Liturgy of Mar Addai (his teacher) and Mar Mari. Mar Mari is well known for his dedication to the spread of the Gospel in the unknown lands of the earth, turning the very hostile people to dedicated adherents of the Gospel of Jesus Christ. He not only spread the Gospel ardently, but also healed many from diseases which seemed very difficult to get cured.

In 2012 Mar Dinkha Church at Chiyyaram, which was formerly a part of Mar Mari Sleeha Parish, was declared a new parish by the present Metropolitan of the Archdiocese, Dr. Mar Aprem Metropolitan, including families from the vicinity of Chiyyaram and neighbouring places.

After the declaration of the new parish, there are around 320 families in this parish. Presently we are taking a census of the families within this parish after the declaration of Mar Dinkha I Church Parish at Chiyyaram. This census is being taken by and with the active pariticipation of the Youths Association of the Parish. We hope to publish a parish directory soon integrating the date we collect through this census.

The Parish is divided into seven wards for the smooth functioning within the parish. The Wards one to seven are: Olive, Rakshakan ( The Saviour), Milka, Nazareth, Ebenezer, Adam and Eden respectively. Members of each ward meet regularly on the 2^nd Sunday of the month. They share the Word of God and also help to promote fellowship among the families within the wards.