This page lists the World Best Year Performance in the year 1998 in the men's decathlon. One of the main events during this season were the 1998 European Championships in Budapest, Hungary, where the competition started on August 18, 1998, and ended on August 19, 1998.
| Rank | Points | Athlete | Venue | Date | Note | |
|---|---|---|---|---|---|---|
| 1 | 8755 | Uniondale, United States | 20/07/1998 | |||
| 2 | 8694 | New Orleans, United States | 20/06/1998 | PB | ||
| 3 | 8672 | Götzis, Austria | 31/05/1998 | |||
| 4 | 8592 | Götzis, Austria | 31/05/1998 | |||
| 5 | 8589 | Tallinn, Estonia | 05/07/1998 | |||
| 6 | 8587 | Budapest, Hungary | 20/08/1998 | |||
| 7 | 8573 | Götzis, Austria | 31/05/1998 | NR | ||
| 8 | 8571 | Budapest, Hungary | 20/08/1998 | NR | ||
| 9 | 8566 | Alhama de Murcia, Spain | 17/05/1998 | NR | ||
| 10 | 8526 | Alhama de Murcia, Spain | 17/05/1998 | PB | ||
| 11 | 8490 | Kuala Lumpur, Malaysia | 18/09/1998 | NR | ||
| 12 | 8392 | Budapest, Hungary | 20/08/1998 | |||
| 13 | 8307 | Kuala Lumpur, Malaysia | 18/09/1998 | PB | ||
| 14 | 8236 | Ratingen, Germany | 21/06/1998 | |||
| 15 | 8231 | Ratingen, Germany | 21/06/1998 | |||
| 16 | 8228 | Götzis, Austria | 31/05/1998 | |||
| 17 | 8214 | Götzis, Austria | 31/05/1998 | PB | ||
| 18 | 8183 | New Orleans, United States | 20/06/1998 | |||
| 19 | 8179 | Götzis, Austria | 31/05/1998 | PB | ||
| 20 | 8177 | Emmeloord, Netherlands | 17/05/1998 | |||
| 21 | 8174 | Budapest, Hungary | 20/08/1998 | |||
| 22 | 8140 | Budapest, Hungary | 20/08/1998 | |||
| 23 | 8128 | Lubbock, United States | 09/08/1998 | PB | ||
| 24 | 8123 | New Orleans, United States | 20/06/1998 | |||
| 25 | 8118 | Maracaibo, Venezuela | 16/08/1998 | |||
| 26 | 8114 | Tallinn, Estonia | 05/07/1998 | |||
| 27 | 8103 | Tallinn, Estonia | 05/07/1998 | |||
| 28 | 8090 | Maracaibo, Venezuela | 16/08/1998 | |||
| 29 | 8081 | New Orleans, United States | 20/06/1998 | |||
| 30 | 8081 | Budapest, Hungary | 20/08/1998 | |||
| 31 | 8058 | Alhama de Murcia, Spain | 17/05/1998 | |||
| 32 | 8034 | Desenzano del Garda, Italy | 17/05/1998 | |||
| 33 | 8011 | Budapest, Hungary | 20/08/1998 | |||
| 34 | 8007 | Kuala Lumpur, Malaysia | 18/09/1998 | |||
| 35 | 8000 | Alhama de Murcia, Spain | 17/05/1998 | |||
| 36 | 7995 | Götzis, Austria | 31/05/1998 | PB | ||
| 37 | 7981 | Krasnodar, Russia | 20/05/1998 | |||
| 38 | 7979 | Emmeloord, Netherlands | 24/05/1998 | |||
| 39 | 7947 | New Orleans, United States | 20/06/1998 | |||
| 40 | 7946 | Ibach, Switzerland | 30/08/1998 | |||
| 41 | 7930 | Budapest, Hungary | 20/08/1998 | |||
| 42 | 7918 | Lubbock, Germany | 09/08/1998 | |||
| 43 | 7890 | Vaterstetten, Germany | 30/08/1998 | |||
| 44 | 7885 | Götzis, Austria | 31/05/1998 | |||
| 45 | 7882 | Cartagena, Spain | 19/07/1998 | |||
| 46 | 7872 | Ratingen, Germany | 21/06/1998 | PB | ||
| 47 | 7872 | Tallinn, Estonia | 05/07/1998 | PB | ||
| 48 | 7868 | Jona, Switzerland | 26/07/1998 | |||
| 49 | 7859 | Kuala Lumpur, Malaysia | 18/09/1998 | |||
| 50 | 7858 | Lynchburg, United States | 12/05/1998 |