Didier Pittet (born 20 March 1957 in Geneva, Switzerland) is an infectious diseases expert and the director of the Infection Control Programme and WHO Collaborating Centre on Patient Safety, University Hospital of Geneva, Geneva, Switzerland. Since 2005, Pittet is also the External Lead of the World Health Organization (WHO) Global Patient Safety Challenge "Clean Care is Safer Care" and African Partnerships for Patient Safety.
In the 2007 New Year Honours List, Didier Pittet was awarded the Honorary Commander of the Order of the British Empire (CBE) in recognition of his services related to the prevention of healthcare-associated infections in the UK.