Report On Brunei

FO 572/39, also called Report On Brunei or Report On Brunei in 1904, is a report written by British Consul Malcolm Steward Hannibal McArthur on 5 December 1904 in Singapore to the British Foreign Office. It concerned the social and political climate of British Protectorate Brunei and how the British foreign policy should proceed. The report also covers Brunei's economy, government structure, social institutions and territorial disputes in the Limbang claim.

FO 572/39 was McArthur's final report to the Foreign Office in his Brunei series and was pertinent to the future of the Sultanate. Britain had considered partitioning Brunei between neighbouring Sarawak and Sabah, under Rajah Charles Brooke and the North Borneo Chartered Company respectively. McArthur's report instead argued for the continuation of Brunei under British protection, and proposed the implementation of the Malayan British Residency system to reform the country. The report succeeded in persuading the Foreign Office and McArthur was installed as the first British Resident of Brunei in 1906.

The report was crucial to the survival of Brunei as a nation-state and has been referred to as the most important document of modern Brunei history. The British Residency would exist until 1959, before being replaced by a Brunei administration.