The Royal Brunei Mausoleum is a Royal Mausoleum of Brunei located at Jalan Tutong, Bandar Seri Begawan, Brunei. The Mausoleum is the main resting place and burial ground for several Sultans of Brunei and members of the Royal Family. The Royal Mausoleum was opened during the reign of Sultan Omar 'Ali Saifuddin I who later became the first monarch to be buried in the Mausoleum when he died in 1795.

Omar Ali Saifuddien Sa'adul Khairi Waddien was the 28th Sultan of Brunei, reigning from 1950 until his abdication in 1967.