A Disappearing Number is a 2007 play co-written and devised by the Théâtre de Complicité company and directed and conceived by English playwright Simon McBurney. It was inspired by the collaboration during the 1910s between the pure mathematicians Srinivasa Ramanujan from India, and the Cambridge University don G.H. Hardy.

Simon Montagu McBurney is an English actor, playwright, and theatre and opera director. He is the founder and artistic director of the Théâtre de Complicité, London. He has had roles in the films The Manchurian Candidate, Friends with Money, The Last King of Scotland, The Golden Compass, The Duchess, Robin Hood, Harry Potter and the Deathly Hallows – Part 1, Tinker Tailor Soldier Spy, Magic in the Moonlight, The Theory of Everything, and Mission: Impossible – Rogue Nation. He played Cecil the choirmaster in BBC's The Vicar of Dibley.