Geiss or Geiß is a surname of German origin. Notable people with the surname include:Anton Geiss (1858–1944), German politician in the Republic of Baden Bill Geiss (1858–1924), American baseball player Christof Geiß, German mathematician Doug Geiss, American politician from Michigan Emil Geiss (1867–1911), American baseball player Erika Geiss, American politician from Michigan Imanuel Geiss (1931–2012), German historian James Geiss (1950–2000), American sinologist, historian, and author Johannes Geiss (1926–2020), German physicist Karlmann Geiß (1935–2025), German jurist and judge Louisette Geiss, American writer, lyricist, and producer Michel Geiss, French sound engineer, instrument designer and musician Robert Geiss, German businessman and TV personality Robin Geiss, German public international law scholar and academic Tony Geiss (1924–2011), American producer, screenwriter, songwriter and author