Frank Kurt Claude Belfrage (born 13 March 1942) is a Swedish economist and diplomat who was State Secretary for Foreign Affairs between 2006 and 2014, heading the Ministry for Foreign Affairs under then Minister for Foreign Affairs Carl Bildt. He was previously Ambassador of Sweden to the European Union from 1994 to 1999 and Ambassador of Sweden to France from 2001 to 2006.

Belfrage is a member of the noble Belfrage family. He is the son of diplomat Kurt-Allan Belfrage and his wife, Renée France Paule Puaux. He is the nephew of Leif Belfrage who was State Secretary for Foreign Affairs from 1956 to 1967. He is married and has four daughters.

Belfrage was part of the 2016 SVT documentary Springnotan^[1] revealing to the Swedish people how some of their political leaders hid money from tax authorities. Belfrage used a temporary tax amnesty, avoiding imprisonment, where his name was revealed.

• H. M. The King's Medal, 12th size gold medal on Seraphim Order ribbon^[2]
• Commander of the Legion of Honour
• Decoration of Honour in Gold for Services to the Republic of Austria (1968)^[3]

• List of people named in the Panama Papers

• Government Offices of Sweden: State Secretary for Foreign Affairs Frank Belfrage