Caspar Pemberton Scott Bowden (19 August 1961 – 9 July 2015) was a British privacy advocate, formerly chief privacy adviser at Microsoft.
Styled as "an independent advocate for information privacy rights, and public understanding of privacy research in computer science", he was on the board of the Tor anonymity service.
Having predicted US mass surveillance programmes such as PRISM from open sources, he gathered renewed attention after the Snowden leaks vindicated his warnings.