Dame Denise Mary Holt, DCMG (née Mills; born 1 October 1949, Vienna, Austria) was British Ambassador to Mexico (2002–05) and Spain and Andorra (2007–09). She is currently the Chair of Council at the University of Sussex. A Non-Executive Director of HSBC Bank plc (2011-) and Chairman of M&S Bank (an HSBC subsidiary), Denise joined the Board of Nuffield Health in 2013 and in 2014 became a NED on the Board of Iberdrola SA, a Spanish energy company, having previously served on the Boards of Scottish Power Renewables and Scottish Power Energy Holdings (both Iberdrola subsidiaries).