Hannah Fry is a British mathematician, author, and radio and television presenter. She is Professor in the Mathematics of Cities at the UCL Centre for Advanced Spatial Analysis. She studies the patterns of human behaviour, such as interpersonal relationships and dating, and how mathematics can apply to them. Fry delivered the 2019 Royal Institution Christmas Lectures.

She attended Presdales School in Ware, Hertfordshire, England, where a teacher inspired her to study mathematics. She subsequently graduated from University College London (UCL). In 2011, she submitted a thesis based on the Navier–Stokes equations, and was awarded a PhD from the department of Mathematics by UCL.