Siim Kallas, Estonian soldier and politician, 13th Prime Minister of Estonia
Siim Kallas (Estonian pronunciation: [ˈsiːm ˈkɑlːɑs]; born 2 October 1948) is an Estonian politician who was the Prime Minister of Estonia and a European Commissioner. He served as the European Commissioner for Transport between 2010 and 2014. Before that he was the European Commissioner for Administrative Affairs, Audit and Anti-Fraud between 2004 and 2009. In both Barroso Commissions he was also a Vice-President. He was twice appointed the Acting Commissioner for Economic and Monetary Affairs and the Euro in Olli Rehn's stead, from 19 April 2014 to 25 May 2014 while he was on electoral campaign leave for the 2014 elections to the European Parliament and from 1 July 2014 to 16 July 2014 after he took up his seat.Prior to his tenure as a European Commissioner, Kallas was the Prime Minister of Estonia, Estonian Minister of Finance, Estonian Minister of Foreign Affairs, a member of the Supreme Council of the Soviet Union and a member of the Riigikogu. Kallas is a member and former leader of the free-market liberal Estonian Reform Party and a former vice-president of Liberal International.

After leaving the European Commission, Kallas ran in the Estonian presidential election in 2016, but was not elected. In October 2017, he started as the municipal mayor of Viimsi Parish.