Sir Spenser Buckingham St. John GCMG FRGS (22 December 1825 – 3 January 1910) was British Consul in Brunei in the mid 19th century.
He was British Consul General in Brunei from 1856 and in 1858 made two ascents of Mount Kinabalu with Hugh Low.
He wrote a book about his explorations in Borneo, Life in the Forests of the Far East (1862), and two biographies of James Brooke (1879 and 1899).
[3] In 1884 St John published a memoir of his experiences in Haiti, Hayti: Or, The Black Republic, which caused public outrage with its sensational tales of cannibalism in the Vodou religion.
St John had a relationship with a Malay woman named Dayang Kamariah, with whom he had a son, Sulong, later baptised as Charles when he was 10.