Sir James Arthur Ratcliffe (born 18 October 1952) is a Monaco-based British billionaire chemical engineer turned financier and industrialist. Ratcliffe is the chairman and chief executive officer (CEO) of the Ineos chemicals group, which he founded in 1998 and of which he still owns two-thirds, and which has been estimated to have a turnover of $15 billion in 2019. He does not have a high public profile, and has been described by The Sunday Times as “publicity shy”.