Hassel is a German, Danish and Norwegian 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
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
Sven Hassel (1917–2012), pen name of the Danish-born writer Børge Willy Redsted Pedersen
Sverre Hassel (1876–1928), Norwegian polar explorer
