Hilary Ockendon (née Mason, born 1941) is a British mathematician who worked at the University of Oxford until retirement in 2008.

She is an emeritus fellow of Somerville College, Oxford, the former president of the European Consortium for Mathematics in Industry, and the author of multiple books on fluid dynamics.

She completed her DPhil in 1968, and her dissertation, Relaxing Gas Flow, was supervised by David Spence.[4].

After her DPhil, she appointed a Tutorial Fellow at Somerville College and a lecturer at the University of Oxford, she held these positions until her retirement in 2008.

The industrial problems she has worked on have come from a wide range of application areas but have mainly focussed on continuum models in fluids and solids.