Riders O
Willi Oberbeck
| 1938 | 1 stage, Tour de France |
Graeme Obree
Other significant victories: World
Open Pursuit Champion, 1993, 1995
| 1993 | Hour Record - 51.596km |
| 1994 | Hour Record - 52.713km |
Angel Ocaña
| 1988 | 1 stage, Vuelta a España |
Luis Ocaña
| 1969 | KoM, Vuelta a España |
| 3 stages, Vuelta a España |
| GP du Midi Libre |
| Catalan Week |
| 1970 | Vuelta a España |
| 2 stages, Vuelta a España |
| Dauphiné - Libéré |
| 1 stage, Tour de France |
| 1971 | Tour of Catalonia |
| Tour of the Basque Country |
| Grand Prix des Nations |
| Trofeo Angelo Baracchi, with Martin Emilio Rodriguez |
| 2 stages, Tour de France |
| 1 stage, Vuelta a España |
| 1972 | Dauphiné - Libéré |
| 1973 | Tour de France |
| 6 stages, Tour de France |
| Dauphiné - Libéré |
| Tour of the Basque Country |
| Catalan Week |
Stan Ockers
| 1941 | GP de l'Escaut |
| 1946 | GP de l'Escaut |
| 1948 | Tour of Belgium |
| 1950 | 1 stage, Tour de France |
| 1953 | Flèche Wallone |
| 1954 | 1 stage, Tour de France |
| 1955 | World Pro Road Race |
| Liège - Bastogne - Liège |
| Flèche Wallone |
| Points Competition, Tour de France |
| Desgrange-Colombo Trophy |
| 1956 | Points Competition, Tour de France |
| 1 stage, Tour de France |
Piet Oellibrandt
| 1960 | GP de l'Escaut |
| 1962 | GP de l'Escaut |
| 1963 | GP de l'Escaut |
Hans-Henrik Oersted
Other significant victories: World
Professional Pursuit Champion, 1984 - 1985, 1987
Stuart O'Grady
| 1998 | 1 stage, Tour de France |
Abraham Olano
| 1995 | World Pro Road Race |
| 3 stages, Vuelta a España |
| 1996 | Tour of Romandy |
| 1997 | 1 stage, Tour de France |
| GP Eddy Merckx |
| 1998 | Vuelta a España |
| 1 stage, Vuelta a España |
| World Time Trial Championship |
| GP Eddy Merckx, with José Garcia Acosta |
| 1999 | 1 stage, Vuelta a España |
| 2000 | Tirreno - Adriatico |
| Criterium Internationale |
| 1 stage, Vuelta a España |
Horst Oldenburg
| 1961 | 1 stage, Tour of Switzerland |
Andrés Oliva
| 1975 | KoM, Giro d'Italia, tied with Francisco Galdos |
| KoM, Vuelta d'Espana |
| 1 stage, Tour of Switzerland |
| 1976 | KoM, Giro d'Italia |
| KoM, Vuelta d'Espana |
| 1978 | KoM, Vuelta d'Espana |
G. Olivieri
| 1920 | 1 stage, Giro d'Italia |
Valère Ollivier
| 1948 | Ghent - Wevelgem |
| 1950 | Kuurne - Brussels - Kuurne |
Giuseppe Olmo
| 1932 | Milan - Turin |
| 1933 | 2 stages, Giro d'Italia |
| 1934 | 3 stages, Giro d'Italia |
| 1935 | Milan - San Remo |
| 4 stages, Giro d'Italia |
| Hour Record - 45.090km |
| 1936 | Giro dell'Emilia |
| 10 stages, Giro d'Italia |
| 1937 | 1 stage, Giro d'Italia |
| 1938 | Milan - San Remo |
Joaquin Olmos
| 1942 | 1 stage, Vuelta a España |
| 1945 | 2 stages, Vuelta a España |
| 1946 | 1 stage, Vuelta a España |
| 1947 | 1 stage, Vuelta a España |
D. Ongenae
| 1976 | 2 stages, Vuelta a España |
Bert Oosterbosch
Other significant victories: World
Professional Pursuit Champion, 1979
| 1980 | Tour de Luxembourg |
| 1 stage, Tour de France |
| 1981 | Four Days of Dunkirk |
| 1982 | Tour of Holland |
| 1 stage, Tour of Switzerland |
| 1983 | 2 stages, Tour de France |
| 1984 | GP E3 |
| 1 stage, Tour of Switzerland |
| 1985 | 1 stage, Vuelta a España |
Hubert Opperman
| 1931 | Paris - Brest - Paris |
I. Orbaiceta
| 1946 | 1 stage, Vuelta a España |
L. Ordiles
| 1977 | 1 stage, Vuelta a España |
Michele Orecchia
| 1932 | 1 stage, Tour de France |
Carlo Oriani
| 1912 | Tour of Lombardy |
| 1913 | Giro d'Italia |
Vito Ortelli
| 1945 | Milan - Turin |
| 1946 | Milan - Turin |
| 1 stage, Giro d'Italia |
| 1947 | Giro del Piemonte |
Unai Osa
M. Osler
| 1975 | 1 stage, Giro d'Italia |
Luis Otaño
| 1961 | 1 stage, Vuelta a España |
| 1964 | 1 stage, Vuelta a España |
| 1966 | 1 stage, Tour de France |
| 1 stage, Vuelta a España |
Harmin Ottenbros
| 1967 | 1 stage, Tour of Switzerland |
| 1968 | 1 stage, Tour of Switzerland |
| 1969 | World Pro Road Race |
Javier Otxoa
| 2000 | 1 stage, Tour de France |
Faustino Ovies Fernandez
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