- Oberasbach (Bavaria)
- Oberharz am Brocken (Saxony-Anhalt)
- Oberhausen (North Rhine-Westphalia)
- Oberhof (Thuringia)
- Oberkirch (Baden-Württemberg)
- Oberkochen (Baden-Württemberg)
- Oberlungwitz (Saxony)
- Obermoschel (Rhineland-Palatinate)
- Obernburg am Main (Bavaria)
- Oberndorf am Neckar (Baden-Württ.)
- Obernkirchen (Lower Saxony)
- Ober-Ramstadt (Hesse)
- Oberriexingen (Baden-Württemberg)
- Obertshausen (Hesse)
- Oberursel (Taunus) (Hesse)
- Oberviechtach (Bavaria)
- Oberweißbach/Thür. Wald (Thuringia)
- Oberwesel (Rhineland-Palatinate)
- Oberwiesenthal, Kurort (Saxony)
- Ochsenfurt (Bavaria)
- Ochsenhausen (Baden-Württemberg)
- Ochtrup (North Rhine-Westphalia)
- Oderberg (Brandenburg)
- Oebisfelde-Weferlingen (Saxony-Anhalt)
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- Oederan (Saxony)
- Oelde (North Rhine-Westphalia)
- Oelsnitz (Saxony)
- Oelsnitz/Erzgeb. (Saxony)
- Oer-Erkenschwick (North Rhine-Westphalia)
- Oerlinghausen (North Rhine-Westphalia)
- Oestrich-Winkel (Hesse)
- Oettingen in Bayern (Bavaria)
- Offenbach am Main (Hesse)
- Offenburg (Baden-Württemberg)
- Ohrdruf (Thuringia)
- Öhringen (Baden-Württemberg)
- Olbernhau (Saxony)
- Olching (Bavaria)
- Oldenburg (Lower Saxony)
- Oldenburg in Holstein (Schleswig-Holst.)
- Olfen (North Rhine-Westphalia)
- Olpe (North Rhine-Westphalia)
- Olsberg (North Rhine-Westphalia)
- Oppenau (Baden-Württemberg)
- Oppenheim (Rhineland-Palatinate)
- Oranienbaum-Wörlitz (Saxony-Anhalt)
- Oranienburg (Brandenburg)
- Orlamünde (Thuringia)
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- Ornbau (Bavaria)
- Ortenberg (Hesse)
- Ortrand (Brandenburg)
- Oschatz (Saxony)
- Oschersleben (Bode) (Saxony-Anhalt)
- Osnabrück (Lower Saxony)
- Osterburg (Altmark) (Saxony-Anhalt)
- Osterburken (Baden-Württemberg)
- Osterfeld (Saxony-Anhalt)
- Osterhofen (Bavaria)
- Osterholz-Scharmbeck (Lower Saxony)
- Osterode am Harz (Lower Saxony)
- Osterwieck (Saxony-Anhalt)
- Ostfildern (Baden-Württemberg)
- Ostheim vor der Rhön (Bavaria)
- Osthofen (Rhineland-Palatinate)
- Östringen (Baden-Württemberg)
- Ostritz (Saxony)
- Otterberg (Rhineland-Palatinate)
- Otterndorf (Lower Saxony)
- Ottweiler (Saarland)
- Overath (North Rhine-Westphalia)
- Owen (Baden-Württemberg)
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