The men's decathlon event at the 2004 World Junior Championships in Athletics was held in Grosseto, Italy, at Stadio Olimpico Carlo Zecchini on 14 and 15 July. Junior implements (valid until 2005) were used, i.e. 106.7 cm (3'6) (senior implement) hurdles, as well as 6 kg shot and 1.75 kg discus.
| Gold | Andrei Krauchanka | |
| Silver | Aleksey Sysoyev | |
| Bronze | Norman Müller |
14/15 July
| Rank | Name | Nationality | 100m | LJ | SP | HJ | 400m | 110m H | DT | PV | JT | 1500m | Points | Notes | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| align=left | align=left | | 11.09 (w: -0.5 m/s) | 7.46 | 14.51 | 2.16 | 48.98 | 14.55 (w: 0.4 m/s) | 43.41 | 4.50 | 52.84 | 4:28.46 | 8126 | ||||
| align=left | align=left | | 10.86 (w: -0.2 m/s) | 6.84 | 16.94 | 1.95 | 49.72 | 15.25 (w: 0.3 m/s) | 53.80 | 4.30 | 57.44 | 4:34.84 | 8047 | ||||
| align=left | align=left | 11.11 (w: -0.2 m/s) | 7.24 | 15.59 | 2.01 | 49.16 | 15.16 (w: 0.4 m/s) | 43.42 | 4.70 | 53.77 | 4:34.70 | 7942 | |||||
| 4 | align=left | align=left | 10.97 (w: -0.5 m/s) | 7.09 | 14.03 | 1.92 | 48.52 | 14.95 (w: 0.3 m/s) | 36.63 | 4.70 | 60.95 | 4:28.82 | 7822 | ||||
| 5 | align=left | align=left | 10.75 (w: -0.5 m/s) | 7.23 | 13.23 | 1.86 | 46.79 | 15.57 (w: 0.4 m/s) | 35.28 | 4.30 | 47.60 | 4:18.68 | 7542 | ||||
| 6 | align=left | align=left |  | 11.32 (w: -0.5 m/s) | 6.66 | 14.31 | 2.01 | 51.85 | 15.32 (w: 0.4 m/s) | 45.09 | 4.10 | 58.20 | 4:44.44 | 7405 | |||
| 7 | align=left | align=left | 11.25 (w: -0.5 m/s) | 6.82 | 13.07 | 1.89 | 49.91 | 14.84 (w: -0.2 m/s) | 35.82 | 3.80 | 56.26 | 4:28.01 | 7224 | ||||
| 8 | align=left | align=left |  | 11.61 (w: -0.5 m/s) | 6.53 | 12.17 | 1.95 | 50.99 | 15.34 (w: -0.2 m/s) | 42.72 | 4.40 | 55.45 | 4:42.13 | 7176 | |||
| 9 | align=left | align=left | 11.49 (w: -0.2 m/s) | 6.89 | 13.55 | 1.86 | 51.44 | 15.20 (w: 0.4 m/s) | 40.38 | 4.40 | 48.12 | 4:34.68 | 7175 | ||||
| 10 | align=left | align=left |  | 11.56 (w: -0.5 m/s) | 6.49 | 13.81 | 1.89 | 50.76 | 15.24 (w: 0.3 m/s) | 36.75 | 4.10 | 56.34 | 4:27.51 | 7146 | |||
| 11 | align=left | align=left | | 11.21 (w: -0.5 m/s) | 6.35 | 15.25 | 1.89 | 48.47 | 15.58 (w: 0.3 m/s) | 45.04 | 3.70 | 50.84 | 4:58.28 | 7129 | |||
| 12 | align=left | align=left |  | 11.61 (w: -0.5 m/s) | 6.62 | 13.53 | 1.98 | 51.72 | 15.82 (w: 0.4 m/s) | 38.08 | 4.10 | 49.56 | 4:29.64 | 7030 | |||
| 13 | align=left | align=left |  | 11.68 (w: -0.5 m/s) | 6.84 | 12.17 | 1.98 | 51.01 | 15.72 (w: 0.3 m/s) | 38.36 | 3.90 | 49.49 | 4:41.23 | 6902 | |||
| 14 | align=left | align=left | 11.37 (w: -0.2 m/s) | 6.76 | 13.81 | 1.86 | 51.58 | 15.59 (w: -0.2 m/s) | 36.07 | 4.20 | 44.03 | 4:51.92 | 6822 | ||||
| 15 | align=left | align=left | 11.31 (w: -0.5 m/s) | 6.61 | 12.97 | 1.86 | 52.75 | 16.01 (w: 0.3 m/s) | 32.90 | 4.10 | 53.16 | 4:43.68 | 6743 | ||||
| 16 | align=left | align=left |  | 11.32 (w: -0.2 m/s) | 6.86 | 13.43 | 1.80 | 50.97 | 15.04 (w: -0.2 m/s) | 37.97 | DNF | 50.62 | 4:52.60 | 6331 | |||
| align=left | align=left | | 11.37 (w: -0.5 m/s) | 6.81 | 14.59 | 1.83 | 50.61 | 15.17 (w: -0.2 m/s) | 44.30 | DNF | DNS | DNS | DNF | ||||
| align=left | align=left |  | 11.05 (w: -0.5 m/s) | 6.89 | 14.26 | 1.83 | 49.45 | 15.02 (w: 0.4 m/s) | 36.41 | DNS | DNS | DNS | DNF | ||||
| align=left | align=left |  | 10.96 (w: -0.2 m/s) | 7.20 | 13.72 | 1.86 | 51.51 | 15.79 (w: -0.2 m/s) | 36.57 | DNS | DNS | DNS | DNF | ||||
| align=left | align=left | 11.19 (w: -0.2 m/s) | 7.13 | 12.97 | 1.98 | 51.01 | 16.75 (w: -0.2 m/s) | DNS | DNS | DNS | DNS | DNF | |||||
| align=left | align=left |  | 11.32 (w: -0.5 m/s) | 6.75 | 14.42 | 1.95 | DNF | DNS | DNS | DNS | DNS | DNS | DNF | ||||
| align=left | align=left | | 11.57 (w: -0.5 m/s) | 4.73 | DNS | DNS | DNS | DNS | DNS | DNS | DNS | DNS | DNF | ||||
| align=left | align=left | | 11.39 (w: -0.5 m/s) | NM | DNS | DNS | DNS | DNS | DNS | DNS | DNS | DNS | DNF | ||||
| align=left | align=left | | DNF | DNS | DNS | DNS | DNS | DNS | DNS | DNS | DNS | DNS | DNF |
According to an unofficial count, 24 athletes from 16 countries participated in the event.