| Name | Seasons | Championships | MotoGP Wins | 500cc Wins | 350cc Wins | Moto2 Wins | 250cc Wins | Moto3 Wins | 125cc Wins | 80cc Wins | 50cc Wins |
|---|---|---|---|---|---|---|---|---|---|---|---|
 P. J. Jacobsen |
2008 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
 Olivier Jacque |
1995-2005, 2007 | 1 250cc - 2000 |
0 | 0 | 0 | 0 | 7 | 0 | 0 | 0 | 0 |
| Quentin Jacquet |
2009-2010 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
 Börje Jansson |
1969-1973 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 0 | 0 |
 Jakub Jantulík |
2009 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
 Raúl Jara |
2001-2002 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Jean-Pierre Jeandat |
1989-1996 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
 David Jefferies |
1993 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Tony Jefferies |
1970-1971 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| Griff Jenkins |
1964-1965, 1967 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Denis Jenkinson |
1950 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
 Steve Jenkner |
1997-2005 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 |
 Syd Jensen |
1949-1950 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Enrique Jerez |
2004-2008 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Lothar John |
1966, 1968-1973 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
 Paul Jordan |
2008-2009 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
.svg.png.webp){kind=small} Serge Julin |
1984-1985, 1987-1989 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
 Károly Juhász |
1987-1988 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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