The Kollam-Kottarakkara Diocese is one of the twenty-four dioceses of the Church of South India. It comprises parishes in Attingal, Vembayam, Chenkulam, Kundara, Kottarakkara, Manjakkala, Punalur and Ayiranelloor regions, which span the Thiruvananthapuram, Kollam and Pathanamthitta districts.
Kollam-Kottarakara diocese was formed on 9 April 2015 after a special conference of the Church synod in Chennai. The parishes of the Kollam-Kottarakara diocese were formerly part of the South Kerala Diocese.