Thomas Bradley Harris (October 29, 1826 in New York City; – May 22, 1866 in Ellena, Borneo) was an American businessman and co-founder of the American colony of "Ellena" together with Joseph William Torrey on the island of Borneo.

Harris was born in New York on October 29, 1826.^[1] He was a professional merchant for ship equipment at the corner of South Street and Maiden Lane. At the first, he was working alone but later with his business partner named Nathan Gilette Pond, where they established the Harris & Pond company. The business premises had already opened by his father in 1805, and since working there they began to exported large quantities of butter to British Hong Kong. This export business was so successful that the trademark was soon copied by other exporters and stuck on its own goods.^[2]

In 1862, Harris left New York to set up his own branch of business in Hong Kong and put an end to unfair business competition in his country.^[3] He left his wife Sarah Louisa née Seymour and his children in Walton, New York, where his father James Harris had already retired from the company in 1857.^[2]

Harris however died of malaria on May 22, 1866 while Torrey was in Hong Kong trying to raise additional funds for their colony.^[5]

Torrey buried him on the top of a nearby hill, now known as Governor's Hill where Harris had built his house on the slopes of the hill and laid a path down to the jetty by the river. A powerful granite block, which is said to require six water buffaloes to carry it in a two-days effort from a nearby quarry to the grave, marks his last retirement.^[6][7] Torrey made the following inscription to this tombstone:

The coffin with the mortal remains was exhumed shortly afterwards and brought back to the United States.^[8][9]

Although Harris and Torrey themselves failed to make a significant personal headway with the establishment of Ellena, the concessions they received made way for the 1878 agreement between the Sultan of Sulu and Gustavo Overbeck. In January 1876, Torrey sold the rights to the American Trading Company of Borneo to Overbeck, who later gained support from the United Kingdom to undertake commercial operations in North Borneo, part of the present day region of Sabah. The region, which falls in Malaysia, has seen a number of controversies over its status, the most recent being a $15 billion claim by purported heirs of the last Sultan of Sulu.

The claimants based their plea on the ambiguous 1878 concession Overbeck won from the Sultan of Sulu. The purported heirs of the last Sulu Sultan filed an arbitration appeal, demanding Malaysia pay $32 billion for exploitation of resources of Sabah, ^[10] claiming the 1878 agreement underscored that the territory had only been leased. Malaysia maintains that the region surrendered its rights once it agreed to join the Malaysian federation in 1963.

In February 2022, Spanish arbitrator Dr Gonzalo Stampa awarded an almost $15 billion settlement in favor of the claimants,^{[11] [12]} which Malaysia challenged at various legal forums.^[13] The International Court of Justice eventually struck down the award in 2023.^[14]