Jason Crain (born August 24, 1966) is an American physicist based in the United Kingdom. He holds the Chair of Applied Physics at the University of Edinburgh in Scotland and was appointed Director of Research at the UK's National Physical Laboratory (NPL) in London (as of 2015) where he previously held the role of Head of Physical Sciences (since 2008). He is also Visiting Professor at the IBM TJ Watson Research Center in New York.