Hannah M. Fry HonFREng FIMA FIET (born 21 February 1984) is a British mathematician, author and broadcaster.

Fry gave the Royal Institution Christmas Lectures in 2019 and has presented several television and radio programmes for the BBC, including The Secret Genius of Modern Life.

[3] In 2015, Fry decided to say "yes" to everything, which led to her trying stand-up comedy, a TED Talk (invited by the German neuroscientist Alina Strasser), and television work.

[20] On 30 March 2014, Fry gave a TED talk at TEDxBinghamtonUniversity[21] titled The Mathematics of Love, which as of December 2023 has attracted over 5.74 million views.

[31] A further credit for 2016 was her co-hosting an episode of the BBC Two Horizon series with Dr Xand van Tulleken, titled How to Find Love Online.

"[35] The programme used Haslemere, Surrey, as the site of the first simulated infection, and coincidentally in February 2020 the town saw the first recorded case of a person contracting COVID-19 from within the UK.

[37] She hosted a one-off 90-minute special of the BBC science programme Tomorrow's World alongside four presenters from the show's original run: Maggie Philbin, Howard Stableford, Judith Hann and Peter Snow.

[42] In 2020, Fry co-presented both The Great British Intelligence Test and Coronavirus Special – Part 2 with Michael Mosley on BBC Two.

[50] Jack Seale for The Guardian wrote that "Fry needs some reward for Unvaccinated (BBC Two), a documentary that requires a near-saintly level of tolerance just to watch, never mind present".

[51] Beginning 10 November 2022, Fry presented a six-part series on BBC Two, The Secret Genius Of Modern Life,[52] in which she investigates topics such as how credit cards came into being, their manufacture and how they work, and how we use apps to order takeaway deliveries.

[55][56] In September 2023, BBC Radio Four started to broadcast Uncharted with Hannah Fry, a series of 15 minute documentaries about graphs.

[57] In July 2024 Fry acted as the 'chief number cruncher' for Channel 4's coverage of the 2024 United Kingdom general election, analysing results data as it came in overnight.

The first, The Mathematics of Love: Patterns, Proofs, and the Search for the Ultimate Equation,[23] includes the "37% rule", a form of the secretary problem according to which roughly the first third of any potential partners should be rejected.

[66] In 2020, Fry won the Asimov Prize, a literary-scientific award organised by the Italian INFN Istituto Nazionale di Fisica Nucleare and GSSI graduate school Gran Sasso Science Institute, for her book Hello World.

[74] She was commissioned by BBC Two[75] to write and present a Horizon documentary about her treatment and its long-term effects (in her case including lymphoedema),[76] in which she explores the statistics behind screening and decision-making by patients and doctors.