The building was completed in 1958 and is an example of modern Islamic architecture. Omar Ali Saifuddien Mosque is named after Omar Ali Saifuddien III, the 28th Sultan of Brunei, who initiated its construction. The mosque unites Mughal architecture and Malay styles and was designed by the architect and sculptor Rudolfo Nolli.
The interior of the mosque with features such as stained glass windows, arches, semi-domes and marble columns. The material used for the building were imported from abroad, the marble from Italy, the granite from Shanghai, the crystal chandeliers from England, and the carpets from Saudi Arabia.
The mosque stands 52 meters high. The main minaret is its tallest feature. In a unique way, it mixes Renaissance and Italian architectural styles.