(chemistry) Otto Wallach
1910 
(medicine) Otto Fritz Meyerhof
1922 
(chemistry) Heinrich Otto Wieland
1927 
(chemistry) Adolf Windaus (a.k.a. Otto)
1928 
(medicine) Otto Heinrich Warburg
1931 
(medicine) Otto Loewi
1936 
(physics) Otto Stern
1943 
(chemistry) Otto Hahn
1944 
(chemistry) Otto Diels
1950 
(chemistry) Ernst Otto Fischer
1973 
(silver) Otto Herschmann
1896 swimming - 100 m freestyle

(silver/bronze) Otto Wahle
1900; 1904 swimming - 1500 m freestyle; swimming - 200 m obstacle; swimming - 400 m freestyle

(bronze) Otto Nilsson
1908 javelin throw

(silver) Otto Trieloff
1908 medley relay

(bronze) Otto Scheff
1908 swimming - 400 m freestyle

(silver) Otto Fahr
1912 swimming - 100 m backstroke

(silver) Otto Neumann
1928 4x400 m relay

(gold/silver) Otto Cordes
1928; 1932 water polo

(bronze) Rudolf van Feggelen (a.k.a. Otto)
1948 water polo

(bronze/gold) Ottó Boros
1956; 1960; 1964 water polo
