Thomas John I'Anson Bromwich FRS (8 February 1875 – 24 August 1929) was an English mathematician, and a fellow of the Royal Society.

[1][2] Thomas John I'Anson Bromwich was born on 8 February 1875, in Wolverhampton, England.

He attended St John's College, Cambridge, where in 1895 he became Senior Wrangler.

[1] Today, Bromwich is perhaps best known for justifying Oliver Heaviside's operator calculus.

Other topics Bromwich investigated include solutions of the Maxwell's equations, and the scattering of electromagnetic plane waves by spheres.