Ritter is the second lowest-ranking title of nobility in German-speaking areas, just above an Edler, considered roughly equal to the title Knight or Baronet.
This list includes only those whose main Wikipedia article includes the titular 'Ritter' in the article name. There are many others whose name could include the title but whose main entry is at the non-titular version of the name.
People whose names include the title Ritter:
Hans Ritter von Adam (1886–1917), German flying ace in World War IRudolf Ritter von Alt (1812–1905), Austrian landscape and architectural painterCarl Ferdinand Ritter von Arlt (1812–1887), Austrian ophthalmologistJoseph Calasanza von Arneth (1791–1863), Austrian numismatist and archaeologistAlfred Ritter von Arneth (1819–1897), Austrian historianLudwig August Ritter von Benedek (1804–1881), Austrian general, commander at the Battle of KöniggrätzJakob Ritter von Danner (1865–1942), Bavarian general, put down the Beer Hall PutschLeopold Ritter von Dittel (1815–1898), Austrian urologistFranz Ritter von Epp (1868–1946), officer in the Imperial German Army, early member of the Nazi partyPaul Johann Anselm Ritter von Feuerbach (1775–1833), German legal scholarGeorg Ritter von Frauenfeld (1807–1873), Austrian naturalistFriedrich Ritter von Friedländer-Malheim (1825–1901), Bohemian-Austrian painterCarl Ritter von Ghega (1802–1860), Albania-Italian engineerRobert Ritter von Greim (1892–1945), German field marshal during World War IIWilhelm Karl Ritter von Haidinger (1795–1871), Austrian mineralogist, geologist, and physicistFranz Ritter von Hauer (1822–1899), Austrian geologistFerdinand Ritter von Hebra (1816–1880), Austrian physician and dermatologistGustav Ritter von Kahr (1862–1934), German conservative politician in BavariaLudwig Ritter von Köchel (1800–1877), Austrian musicologist, catalogued the works of Mozart (K numbers)Karl Heinrich Lang, Ritter von Lang (1764–1835), German historian and statesmanWilhelm Ritter von Leeb (1876–1956), German field marshal during World War IIKarl Gottfried Ritter von Leitner (1800–1890), German author, editor, and publicistJohann Ritter von Oppolzer (1808–1871), Austrian physicianGeorg Ritter von Schönerer (1842–1921), Austrian politicianCarl Franz Anton Ritter von Schreibers (1775–1852), Austrian naturalistLorenz Ritter von Stransky (1889–1923), German engineer and early member of the Nazi PartyWilhelm Ritter von Thoma (1891–1948), German officer who served in World War I, the Spanish Civil War, and World War IIGeorg Ludwig von Trapp (1880–1947), Austrian naval officer, headed the singing family immortalized in The Sound of MusicHeinrich Ritter von Zeissberg (1839–1899), Austrian historianJohann Georg Ritter von Zimmermann (1728–1795), Swiss philosophical writer and physicianAnselm Franz von Ritter zu Groenesteyn (1692–1765), Dutch-German government official and architectEduard Ritter von Weber, the German mathematician