Urheberschaft
- Obernitz, Hans Veit von1
- Obstbau-Verein1
- Oceanic Radio Vertriebsgesellschaft1
- Odo <von Meung>1
- Oecolampadius, Johannes1
- Oelinger, Albert1
- Oelpenich, Alexander1
- Oertel, Karl Otto1
- Oertlin, Christoph1
- Oest, Johann Friedrich1
- Oesterreicher, Tobias von1
- Oettingen, Arthur J. von1
- Offermanns, Franz1
- Office of Military Government for Germany (U.S.) (OMGUS)1
- Ohlenschlager, Friedrich1
- Ohliger, Wilhelm1
- Old Bond Dressing gown fashion1
- Oldendorp, Johannes1
- Olevian, Caspar1
- Olshausen, Hugo1