Graetz or Grätz is a German surname and place name and may refer to:
People Gidon Graetz (born 1929), Swiss-Israeli sculptor Bibi Graetz, owner and winemaker of Toscana wine producer Azienda Agricola Testamatta, son of Gidon Heinrich Graetz (1817–1891), German Jewish historian Herbert Graetz (1893–1985), Australian Olympic rower Jean Graetz (1929-2020), American civil rights leader Joseph Graetz (1760–1826), German composer, organist, and educator Leo Graetz (1856–1941), German physicist, son of Heinrich Paul Graetz (1889–1937), German actor Robert Graetz (1928–2020), American Lutheran pastor and civil rights leader Rudi Graetz (1907–1977), German esperantist Windisch-Graetz, princely family of the Holy Roman Empire
Places Grätz, the German name of Grodzisk Wielkopolski, Poland Grätz, the German name of Hradec nad Moravicí, Czech Republic Kreis Grätz, one of several Kreise (counties) in the Prussian Province of Posen Windischgrätz, the German name of Slovenj Gradec, Slovenia
Other Graetz number, a dimensionless number that characterizes laminar flow in a conduit in fluid dynamics Graetz AG, German manufacturer of petrol lamps and radios
See also Gratz (disambiguation)