Blass can refer to several people:
- Andreas Blass, an American mathematician.
- Bill Blass (1922–2002), US fashion designer
- Friedrich Blass (1843–1907), German classical scholar
- Moses Blass (born 1937), Brazilian Olympic basketball medallist
- Steve Blass, baseball player and announcer
- Wolf Blass, East German-born Australian winemaker
- Simcha Blass, (1897–1982), Israeli water engineer, inventor of drip irrigation systems
- William Joel Blass, Mississippi attorney, educator, and politician