The Roman Catholic Diocese of Cubao (Latin: Dioecesis Cubaoensis) is a diocese of the western Latin Church of the Catholic Church in district of Cubao in Quezon City, in northern Metro Manila, Philippines.

The diocese was created by Pope John Paul II on June 28, 2003[2] from the ecclesiastical district of Cubao of the Roman Catholic Archdiocese of Manila.

Ugong Norte along EDSA-Ortigas), and District 4 (except the lower part of Barangay Bagong Lipunan ng Crame).

In addition to, it comprises some barangays in District 6, namely Sangandaan, Baesa, Apolonio Samson, Unang Sigaw, Balon-bato (or Balumbato), New Era, and portions of Culiat and Tandang Sora that are found on the southern portion across Tandang Sora Avenue.

[3] Camp Aguinaldo and the portion of Camp Crame south of Bonny Serrano Avenue, with Veterans Memorial Medical Center along North Avenue, Project 6, are under the jurisdiction of the Military Ordinariate of the Philippines, whereas Barangay Matandang Balara and EDSA Shrine are under the Diocese of Novaliches and Archdiocese of Manila, respectively.