Omar Ali Saifuddien Mosque is a mosque in Bandar Seri Begawan, the capital of Brunei. It is one of the country's two masjid negara or national mosques, as well as a national landmark. It is one of the largest and oldest mosques in the country and is named after Omar Ali Saifuddien III (1914–1986), the 28th Sultan of Brunei and the father of the current monarch Sultan Hassanal Bolkiah. The mosque serves as a symbol of the Islamic faith in Brunei.

Jame' Asr Hassanil Bolkiah Mosque, is a mosque in Kampong Kiarong of Bandar Seri Begawan, Brunei. It is named after Hassanal Bolkiah, the 29th and current Sultan of Brunei. It is one of the two state mosques, the other Omar Ali Saifuddien Mosque.