Hassel is a German, Danish, Norwegian and Swedish surname. Notable people with this surname include the following:
Bryan Hassel, American popular writer on education Danny Hassel (born 1967), American actor Georg Hassel (1770–1829), German geographer Henrik Hassel (1700–1776), Finnish professor and humanist Kai-Uwe von Hassel (1913–1997), German politician from Schleswig-Holstein associated with the CDU party Karl-Heinz von Hassel (1939–2016), German actor Kaspar Hassel (1877–1962), Norwegian sailor Odd Hassel (1897–1981), Norwegian physical chemist and Nobel Laureate Sverre Hassel (1876–1928), Norwegian polar explorer Tina Hassel (born 1964), German journalist