Cassel is a surname. Notable people with the surname include:
Christine K. Cassel, American physician David Cassel, German historian and Jewish theologian Erik Cassel, Co-founder of Roblox Ernest Cassel, British capitalist Felix Cassel, British Judge Advocate-General (Karl) Gustav Cassel, 1866–1945, Swedish economist Hartwig Cassel, German chess promoter Henry B. Cassel, U.S. congressman from Pennsylvania Jack Cassel, Major League Baseball player Jean-Pierre Cassel, French actor Jochen Cassel (born 1981), German badminton player Marcus Cassel, American football player Matt Cassel, American football quarterback Paulus Stephanus Cassel, 19th century Jewish convert to Christianity Sandra Cassel, American actress Seymour Cassel (1935–2019), American actor Vincent Cassel, French actor
Fictional characters Gil Cassel, a character in the Star Wars: Legacy graphic novel series Jared Cassel, a character in the Star Wars: Legacy graphic novel series Jory Cassel, a character from the "A Song of Ice and Fire" fantasy series Ser Rodrik Cassel, a character from the "A Song of Ice and Fire" fantasy series