Thomas Brooke Benjamin, FRS[1] (15 April 1929 – 16 August 1995) was an English mathematical physicist and mathematician, best known for his work in mathematical analysis and fluid mechanics, especially in applications of nonlinear differential equations.

[2] Benjamin was educated at Wallasey Grammar School on the Wirral, the University of Liverpool (BEng.

[5] From 1979 until his death in 1995 he was Sedleian Professor of Natural Philosophy at the Mathematical Institute, University of Oxford, and a fellow of The Queen's College, Oxford.

[6] The Benjamin–Ono equation describes one-dimensional internal waves in deep water.

Benjamin studied it with Jerry L. Bona and J. J. Mahony in a 1972 paper.