The Puerto Princesa Cathedral (Filipino: Katedral ng Puerto Princesa), also known as the Immaculate Conception Cathedral Parish (Filipino: Parokyang Katedral ng Kalinis-linisang Paglilihi), is a Roman Catholic cathedral in the city of Puerto Princesa, Palawan in western Philippines. It is in the Neo-Gothic architectural tradition and is the mother church of the Apostolic Vicariate of Puerto Princesa which covers the municipalities of Palawan west of Puerto Princesa City. It is located at the border of Barangay Matiyaga Poblacion and Liwanag Poblacion, near the Port of Puerto Princesa. At 118° east longitude, it is the westernmost cathedral in the country.