Antonio Maria Costa (born 16 June 1941) is an Italian economist.
He lives in Vienna and Brussels.
From May 2002 to August 2010 Costa served as an Under-Secretary-General of the United Nations to the positions of Executive Director of the United Nations Office on Drugs and Crime (UNODC) and Director-General of the United Nations Office in Vienna (UNOV).
Costa was the first to hold this double tenure for two consecutive 4-year mandates.Before this, Costa was Secretary General of the European Bank for Reconstruction and Development (EBRD) from 1994-2002 and EU Director General for Economics and Finance (DGII) at the European Union from 1987-1992.Costa is currently Editor-in-Chief of the Journal of Policy Modelling.