This page lists the World Best Year Performance in the year 2008 in the men's decathlon. The main event during this season were the 2008 Olympic Games in Beijing, PR China, where the competition was held at the Beijing National Stadium on August 21 and August 22.
| Rank | Points | Athlete | Venue | Date | Note | |
|---|---|---|---|---|---|---|
| 1 | 8832 | Eugene, United States | 2008-06-30 | |||
| 2 | 8585 | Hengelo, Netherlands | 2008-06-29 | |||
| 3 | 8534 | Eugene, United States | 2008-06-30 | |||
| 4 | 8527 | Beijing, PR China | 2008-08-22 | |||
| 5 | 8511 | Eugene, United States | 2008-06-30 | |||
| 6 | 8504 | Götzis, Austria | 2008-06-01 | |||
| 7 | 8497 | Götzis, Austria | 2008-06-01 | |||
| 8 | 8434 | Kladno, Czech Republic | 2008-06-19 | |||
| 9 | 8381 | Götzis, Austria | 2008-06-01 | |||
| 10 | 8372 | Ratingen, Germany | 2008-06-22 | |||
| 11 | 8273 | Ratingen, Germany | 2008-06-22 | |||
| 12 | 8253 | Beijing, PR China | 2008-08-22 | |||
| 13 | 8248 | Ratingen, Germany | 2008-06-22 | |||
| 14 | 8242 | Götzis, Austria | 2008-06-01 | |||
| 15 | 8241 | Beijing, PR China | 2008-08-22 | |||
| 16 | 8238 | Beijing, PR China | 2008-08-22 | |||
| 17 | 8233 | Ratingen, Germany | 2008-06-22 | |||
| 18 | 8208 | Götzis, Austria | 2008-06-01 | |||
| 19 | 8199 | Manhattan, United States | 2008-08-03 | |||
| 20 | 8191 | Manhattan, United States | 2008-08-03 | |||
| 21 | 8178 | Beijing, PR China | 2008-08-22 | |||
| 22 | 8175 | Manhattan, United States | 2008-08-03 | |||
| 23 | 8143 | Manhattan, United States | 2008-08-03 | |||
| 24 | 8142 | Desenzano del Garda, Italy | 2008-05-11 | |||
| 25 | 8122 | Eugene, United States | 2008-06-30 |