Blass is a surname. Notable people with the surname include:
Andreas Blass, an American mathematician
Bill Blass (1922–2002), US fashion designer
Dave Blass, Production Designer for Film and Television
Friedrich Blass (1843–1907), German classical scholar
Moses Blass (born 1937), Brazilian Olympic basketball medallist
Simcha Blass, (1897–1982), Israeli water engineer, inventor of drip irrigation systems
Steve Blass, baseball player and announcer
Valentin Blass, (born 1995) German basketball player
William Joel Blass, Mississippi attorney, educator, and politician
Wolf Blass, East German-born Australian winemaker
