This page lists the World Best Year Performance in the year 1990 in the men's decathlon. One of the main events during this season were the 1990 European Championships in Split, Yugoslavia, where the competition started on August 28, 1990, and ended on August 29, 1990.
| Rank | Points | Athlete | Venue | Date | Note | |
|---|---|---|---|---|---|---|
| 1 | 8574 | Split, Yugoslavia | 1990-08-29 | |||
| 2 | 8525 | Auckland, New Zealand | 1990-01-29 | |||
| 3 | 8481 | Götzis, Austria | 1990-06-17 | |||
| 4 | 8436 | Split, Yugoslavia | 1990-08-29 | PB | ||
| 5 | 8403 | Seattle, United States | 1990-07-25 | |||
| 6 | 8358 | Seattle, United States | 1990-07-25 | |||
| 7 | 8330 | Seattle, United States | 1990-07-25 | |||
| 8 | 8289 | Salzgitter, West Germany | 1990-07-22 | |||
| 9 | 8275 | Neubrandenburg, East Germany | 1990-05-27 | |||
| 10 | 8256 | Salzgitter, West Germany | 1990-07-22 | PB | ||
| 11 | 8249 | Split, Yugoslavia | 1990-08-29 | |||
| 12 | 8216 | Split, Yugoslavia | 1990-08-29 | |||
| 13 | 8214 | Split, Yugoslavia | 1990-08-29 | |||
| 14 | 8169 | Sochi, Soviet Union | 1990-05-20 | |||
| 15 | 8146 | Split, Yugoslavia | 1990-08-29 | |||
| 16 | 8138 | Götzis, Austria | 1990-06-17 | |||
| 17 | 8121 | Sochi, Soviet Union | 1990-05-20 | |||
| 18 | 8098 | Emmitsburg, United States | 1990-09-09 | |||
| 19 | 8088 | Sochi, Soviet Union | 1990-05-20 | |||
| 20 | 8057 | Ljubljana, Yugoslavia | 1990-07-01 | |||
| 21 | 8054 | Spokane, United States | 1990-07-22 | |||
| 22 | 8052 | Split, Yugoslavia | 1990-08-29 | |||
| 23 | 8040 | Salzgitter, West Germany | 1990-07-22 | |||
| 24 | 8033 | Emmitsburg, United States | 1990-09-09 | |||
| 25 | 8015 | Värnamo, Sweden | 1990-07-29 |