Index on Censorship is an organisation campaigning for freedom of expression, which produces a quarterly magazine of the same name from London. It is directed by the non-profit-making Writers and Scholars International, Ltd (WSI) in association with the UK-registered charity Index on Censorship, which are both chaired by the British television broadcaster, writer and former politician Trevor Phillips. Index is based at 1 Rivington Place in central London.

Pavel Mikhailovich Litvinov is a Russian-born U.S. physicist, writer, teacher, human rights activist and former Soviet-era dissident.