Frank Thomas Smith (born 24 February 1948) is Emeritus Goldsmid Professor in the department of mathematics in the University College London, a specialist in fluid mechanics.
Smith was educated at Bournemouth Grammar School and the University of Oxford where he was awarded a Bachelor of Arts (BA) degree as an undergraduate student of Jesus College, Oxford followed by a Doctor of Philosophy (DPhil) degree in 1972 for research supervised by David Spence, John Ockendon and Keith Stewartson.
Smith made significant contributions to triple-deck theory applied to boundary layer flows, separated flows, biofluid mechanics, and skimming-stone problem. Smith served as director of Lighthill Institute of Mathematical Sciences (LIMS).
Smith supervised ten successful PhD students including Hannah Fry and Jitesh Gajjar.
Smith was elected a Fellow of the Royal Society (FRS) in 1984.