Siobhan Roberts is a Toronto journalist and author whose work focuses on mathematics and science.

Her first book, King of Infinite Space: Donald Coxeter, The Man Who Saved Geometry, won the Mathematical Association of America's 2009 Euler Prize for expanding the public's view of mathematics. She was the writer and associate producer on a documentary film about Coxeter, The Man Who Saved Geometry, which aired in September 2009 on TVOntario's The View From Here.

She is currently a visitor at the Institute for Advanced Study in Princeton, where she is writing a biography of the Princeton University mathemagician John Horton Conway (Walker & Company/Bloomsbury USA).

As a freelancer she contributes to numerous publications including The Globe and Mail, The Walrus, Canadian Geographic, The Mathematical Intelligencer, Leonardo, The New York Times "Science Times," Seed, and the Smithsonian.