Susan North Brown (22 December 1937 – 11 August 2017) was a professor of mathematics at University College London[1] and a leading researcher in the field of fluid mechanics.

[2] An exact timeline for Susan Brown's career has been difficult to pin down, but a newsletter published by Department of Mathematical and Physical Sciences at UCL shortly after her death offers a framework for her career achievements and highlights the esteem in which she was held by colleagues and students.

The afore-mentioned departmental newsletter that recapped her accomplishments after her death expresses the belief that Brown was the first female in the UK to be appointed to a professorship in Mathematics, but Joan E. Walsh was promoted to a professorship in mathematics at the University of Manchester in 1974.

Quoting from the afore-mentioned departmental newsletter, " Together they published 29 papers and pioneered early developments of 'triple-deck' theory, which, in turn, enabled resolution of long-standing questions in steady and unsteady trailing-edge flows, and addressed associated important aerodynamic applications.

Another area for which Brown was especially renowned was a series of discussions of critical layers, especially effects of viscosity and nonlinearity and applications to geophysical flows such as atmospheric jets.