- Ot·to [ot-oh; German awt-oh] /ˈɒt oʊ; German ˈɔt oʊ/, 1884–1951, German physiologist: Nobel Prize in medicine 1922.
- Otto (Fritz) (ˈɔto). 1884–1951, German physiologist, noted for his work on the metabolism of muscles. He shared the Nobel prize for physiology or medicine 1922
- German-born American physiologist. He shared a 1922 Nobel Prize for his discovery of the relationship between consumption of oxygen and production of lactic acid in muscles.