Sultan Omar Ali Saifuddin Mosque (มัสยิดสุลต่าน โอมาร์ อาลี ไซฟุดดิน) is a royal Islamic mosque located in Bandar Seri Begawan, the capital of the Sultanate of Brunei. The mosque considered one of the most beautiful mosques in the Asia Pacific and a major landmark and tourist attraction of Brunei.