The Diocese of Parañaque is a diocese of the Latin Church of the Catholic Church in Metro Manila, Philippines which encompasses the cities of Parañaque, Las Piñas, and Muntinlupa. Previously belonging to the Archdiocese of Manila, the Ecclesiastical District of Parañaque was declared an independent diocese on December 7, 2002, by Pope John Paul II by virtue of the papal bull Ad Efficacius. The district bishop, Jesse Eugenio Mercado, also one of the auxiliary bishops of Manila, was designated as its first and only bishop and was formally installed on January 28, 2003.

Parañaque, officially the City of Parañaque, is a first class highly urbanized city in the National Capital Region of the Philippines. According to the 2020 census, it has a population of 689,992 people.