Stephan Adrian Shakespeare (né Kukowski; born 9 April 1957) is the German-British co-founder and Chief Executive Officer (CEO) of the British Internet-based market research and opinion polls company YouGov.

After graduating from Oxford, he took a one-year teaching course in Kingston upon Thames, during which time he was a member of the Socialist Workers' Student Society.

After returning home to the UK from the US, he taught at Charles Edward Brooke girls secondary school in Lambeth where he used his original family name.

During the campaign, Margaret Thatcher, against whom he had demonstrated as a student 17 years earlier, came to Colchester in order to support his attempt to win the seat for the Conservatives.

In July 2008, The Guardian listed Shakespeare as among the top 100 media personalities in the UK, calling him "the pollster with the uncanny ability of getting it right.