Brendan Richard O'Neill (born 6 December 1948) is a British business executive.
O'Neill studied natural sciences at Churchill College, Cambridge (MA) before taking a PhD in Chemistry from the University of East Anglia.[1] He served as CEO of ICI from 1999-2003, having previously been CEO of Diageo from 1997-1998. He has held directorships at Informa, Aegis Group, Guinness, United Distillers and EMAP, is a Fellow of the Chartered Institute of Management Accountants, and is a Trustee of Cancer Research UK.