Lars Paul-Erich "Lasse" Hattinen (16 May 1923 – 3 January 1961) was a Finnish World War II flying ace and a commercial airliner pilot. At the time, he was the youngest flying ace and he achieved 6 air victories with the Morane-Saulnier M.S.406 between 25 June and 30 July 1944. Hattinen is recognized as the only pilot who flew the Mörkö Morane (also called "Bogey" and "Ogre Morane"^[1]), the plane's version developed in Finland.^[2] His three victories flying this plane were the only kills scored by the fighter.^[3] He had four regular victories flying Morane planes when he achieved his first Yak-1 victory in 1944.^[2] On his last flight, his plane caught fire, and he only barely survived with burns.

After the war, he worked as an airliner pilot for the Finnish flag carrier Aero O/Y. He was the pilot of the ill-fated Aero Flight 311 which crashed in Kvevlax in January 1961. The investigation revealed that Hattinen and his co-pilot, neither of whom survived the crash, had been drinking heavily the night before the flight.^[4]

The author Seppo Porvali wrote a biography about Hattinen titled Last Ace.