Blass is a surname. Notable people with the surname include:
Andreas Blass, an American mathematicianBill Blass (1922–2002), US fashion designerDave Blass, Production Designer for Film and TelevisionFriedrich Blass (1843–1907), German classical scholarMoses Blass (born 1937), Brazilian Olympic basketball medallistSimcha Blass, (1897–1982), Israeli water engineer, inventor of drip irrigation systemsSteve Blass, baseball player and announcerValentin Blass, (born 1995) German basketball playerWilliam Joel Blass, Mississippi attorney, educator, and politicianWolf Blass, East German-born Australian winemaker