Dan Mircea Geoana (Romanian pronunciation: ['mirt??e?a 'd??e?o?an?]; born 14 July 1958 in Bucharest) is a Romanian politician and former ambassador who served as president of the upper chamber of the Romanian Parliament, the Senate from 20 December 2008 until he was revoked on 23 November 2011.
From 21 April 2005 until 21 February 2010 he was the head of the Partidul Social Democrat (PSD, Social Democratic Party), Romania's largest party.
He was the candidate of the party for the position of President of Romania in the 2009 presidential election.
He was dismissed from PSD on 22 November 2011 but rejoined the party in late 2012.
Now he is the acting president and founder of P.S.RO, the Social Romanian Party founded in April 2015.
He is also the president of Aspen Institute Romania, which is an apolitical and non-profit organisation.
On 17 July 2019 he was appointed deputy secretary general of NATO, replacing Rose Gottemoeller.