Thor Kristen Tjøntveit (28 July 1936 – 3 March 2017) was a Norwegian-American aviator.
After taking his pilot's license, he moved to the United States in 1961; he became an American citizen in 1965.
He established the charter airline Trans Polar in 1970, which went bankrupt the following year.
At the time the 33-million Norwegian krone bankruptcy was the largest in the country's history.
He was indicted in 2003 in the largest value added tax fraud in Norwegian history, but fled the country.