1984 250cc Grand Prix leading entries:
| no. | rider | entrant | bike |
| 1 | Carlos Lavado VEN | Venemotos Racing Team | Yamaha |
| 18 | Ivan Palazzese VEN | Venemotos Racing Team | Yamaha |
| 2 | Christian Sarron FRA | Team Sonauto Gauloises | Yamaha |
| 32 | Jean-Michel Mattioli FRA* | Team Sonauto Gauloises | Yamaha |
| Thierry Rapicault FRA* | Team Sonauto Gauloises | Yamaha | |
| 3 | Toni Mang BRD | HB Team 250 | Yamaha |
| 4 | Hervé Guilleux FRA | Chevallier, etc. | |
| 5 | Thierry Espié FRA | Chevallier | |
| 6 | Martin Wimmer BRD | Mitsui-Yamaha Racing Team | Yamaha |
| 7 | Manfred Herweh BRD | Massa Real GmbH | Real-Rotax |
| 8 | Jean-François Baldé FRA | Pernod | Pernod |
| 10 | Jacques Bolle FRA | Pernod | Pernod |
| 9 | Jacques Cornu SUI | Team Parisienne-Elf | Yamaha |
| 15 | Roland Freymond SUI | Team Parisienne-Elf | Honda RS |
| 12 | Patrick Fernandez FRA | Yamaha | |
| 14 | Alan Carter ENG | Marlboro Team Roberts | Yamaha |
| 55 | Wayne Rainey USA# | Marlboro Team Roberts | Yamaha |
| 16 | Thierry Rapicault FRA | Yamaha | |
| 17 | Jean-Louis Guignabodet FRA | Yamaha / Honda | |
| 20 | Carlos Cardús ESP | JJ Cobas | Cobas |
| 21 | Stéphane Mertens BEL | Team Hugin-Total | Yamaha |
| 23 | Richard Hubin BEL | Team Hugin-Total | Yamaha |
| 22 | Fausto Ricci ITA** | Yamaha | |
| 24 | Harald Eckl BRD | Yamaha / ES | |
| 28 | Teruo Fukuda JAP | Yamaha | |
| 30 | Sito Pons ESP | Kobas Motorcycles | Kobas-Rotax |
| 31 | Karl-Thomas Grässel BRD | Römer Racing Team | Römer, etc. |
| 39 | Manfred Obinger AUT* | Römer Racing Team | Yamaha |
| 33 | Donnie McLeod SCO# | Dalmac Racing | Yamaha |
| 34 | Mario Rademeyer RSA | Yamaha | |
| 36 | Loris Reggiani ITA** | Kawasaki | |
| 37 | Siegfried Minich AUT | Yamaha | |
| 49 | René Délaby LUX | Yamaha, etc. | |
| 51 | Guy Bertin FRA# | MBA | |
| 53 | Andy Watts ENG* | EMC | |
| Roland Freymond SUI | Yamaha | ||
| Jean-Michel Mattioli FRA | Chevallier | ||
| Maurizio Vitali ITA* | MBA |
* selected races only
** did not race full season
# Rainey also raced number 29
# McLeod also raced numbers 36 and 67
# Bertin also raced number 35
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