The men's decathlon event at the 2010 World Junior Championships in Athletics was held in Moncton, New Brunswick, Canada, at Moncton Stadium on 20 and 21 July. Junior implements were used, i.e. 99.0 cm (3'3) hurdles, 6 kg shot and 1.75 kg discus.
| Gold | Kévin Mayer | |
| Silver | Ilya Shkurenev | |
| Bronze | Marcus Nilsson |
20/21 July
| Rank | Name | Nationality | 100m | LJ | SP | HJ | 400m | 110m H | DT | PV | JT | 1500m | Points | Notes | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| align=left | align=left | | 11.12 (w: 1.3 m/s) | 7.41 | 14.01 | 2.04 | 49.39 | 14.21 (w: 0.9 m/s) | 37.57 | 4.70 | 49.76 | 4:21.35 | 7928 | ||||
| align=left | align=left | | 11.25 (w: 1.3 m/s) | 7.26 | 13.48 | 2.01 | 50.46 | 14.81 (w: 0.2 m/s) | 43.15 | 5.00 | 55.49 | 4:42.92 | 7830 | ||||
| align=left | align=left | | 11.30 (w: 0.5 m/s) | 6.93 | 14.55 | 1.92 | 49.54 | 14.75 (w: 0.2 m/s) | 45.18 | 4.60 | 51.64 | 4:25.31 | 7751 | ||||
| 4 | align=left | align=left | 10.90 (w: 0.3 m/s) | 7.36 | 13.14 | 1.95 | 49.11 | 14.25 (w: 0.9 m/s) | 40.36 | 4.60 | 44.62 | 4:36.13 | 7691 | ||||
| 5 | align=left | align=left |  | 10.97 (w: 1.3 m/s) | 7.28 | 15.20 | 1.95 | 50.99 | 14.93 (w: 0.9 m/s) | 41.21 | 4.00 | 63.20 | 4:45.04 | 7677 | |||
| 6 | align=left | align=left | 10.96 (w: 1.3 m/s) | 6.87 | 13.25 | 1.95 | 47.63 | 14.41 (w: 0.2 m/s) | 40.15 | 4.50 | 53.07 | 4:47.48 | 7638 | ||||
| 7 | align=left | align=left | | 11.02 (w: 0.3 m/s) | 7.18 | 14.41 | 1.92 | 49.32 | 14.99 (w: 1.4 m/s) | 36.24 | 4.50 | 52.29 | 4:36.65 | 7568 | |||
| 8 | align=left | align=left | | 11.09 (w: 1.3 m/s) | 6.92 | 14.18 | 1.92 | 49.48 | 14.72 (w: 0.9 m/s) | 39.80 | 4.60 | 44.92 | 4:33.41 | 7515 | |||
| 9 | align=left | align=left |  | 10.96 (w: 1.3 m/s) | 7.02 | 13.71 | 1.98 | 49.76 | 14.85 (w: 1.4 m/s) | 35.89 | 4.40 | 51.95 | 4:36.33 | 7512 | |||
| 10 | align=left | align=left |  | 11.33 (w: 0.5 m/s) | 6.73 | 15.86 | 1.95 | 50.70 | 14.57 (w: 0.2 m/s) | 38.67 | 4.30 | 45.75 | 5:01.55 | 7242 | |||
| 11 | align=left | align=left | | 11.80 (w: 0.3 m/s) | 6.48 | 15.52 | 2.01 | 52.85 | 15.44 (w: 1.4 m/s) | 41.02 | 4.20 | 55.11 | 4:47.66 | 7160 | |||
| 12 | align=left | align=left |  | 10.84 (w: 0.3 m/s) | 7.29 | 12.11 | 1.92 | 50.33 | 14.97 (w: 0.9 m/s) | 39.78 | 3.80 | 49.24 | 5:00.45 | 7132 | |||
| 13 | align=left | align=left |  | 11.20 (w: 1.3 m/s) | 6.90 | 14.16 | 1.83 | 51.94 | 16.28 (w: 1.4 m/s) | 42.35 | 4.10 | 56.22 | 4:54.72 | 7056 | |||
| 14 | align=left | align=left | | 11.26 (w: 1.3 m/s) | 6.88 | 14.07 | 1.89 | 52.46 | 15.86 (w: 1.4 m/s) | 34.45 | 4.40 | 53.37 | 4:49.19 | 7028 | |||
| 15 | align=left | align=left | 11.08 (w: 0.5 m/s) | 6.43 | 13.89 | 1.83 | 50.81 | 14.91 (w: 0.9 m/s) | 38.76 | 4.40 | 49.10 | 5:02.82 | 7027 | ||||
| 16 | align=left | align=left | 11.02 (w: 1.3 m/s) | 7.11 | 13.56 | DNF | 49.53 | 14.38 (w: 0.2 m/s) | 41.66 | 4.20 | 65.00 | 4:47.86 | 6975 | ||||
| 17 | align=left | align=left |  | 11.25 (w: 1.3 m/s) | 6.99 | 11.57 | 1.89 | 50.52 | 16.19 (w: 0.2 m/s) | 35.83 | 3.90 | 46.66 | 4:39.64 | 6796 | |||
| 18 | align=left | align=left |  | 10.90 (w: 0.5 m/s) | 7.24 | 13.17 | 1.77 | 50.28 | 14.99 (w: 1.4 m/s) | 30.50 | 3.70 | 39.25 | 5:05.13 | 6658 | |||
| 19 | align=left | align=left |  | 11.53 (w: 1.3 m/s) | 5.99 | 13.40 | 1.77 | DQ | 15.67 (w: 0.2 m/s) | 42.02 | 4.00 | 57.65 | 5:11.39 | 5916 | |||
| 20 | align=left | align=left |  | 11.52 (w: 1.3 m/s) | 6.27 | 13.36 | 1.80 | 53.05 | 15.89 (w: 0.2 m/s) | 35.53 | DNF | 46.02 | 5:25.36 | 5661 | |||
| 21 | align=left | align=left | | 11.63 (w: 0.3 m/s) | 6.68 | 12.90 | 1.86 | 54.56 | 15.96 (w: 1.4 m/s) | NM | 4.40 | NM | 5:05.95 | 5415 | |||
| 22 | align=left | align=left | 11.52 (w: 0.3 m/s) | 6.29 | 11.01 | 1.83 | 50.69 | DQ | 27.01 | DNS | 45.42 | 4:34.30 | 5024 | ||||
| align=left | align=left | 11.19 (w: 0.5 m/s) | 7.08 | 14.15 | 1.95 | 50.01 | DNF | DNS | DNS | DNS | DNS | DNF | |||||
| align=left | align=left | | 11.68 (w: 0.5 m/s) | 6.81 | 13.54 | 1.83 | 54.23 | DNS | DNS | DNS | DNS | DNS | DNF | ||||
| align=left | align=left | | 10.96 (w: 0.3 m/s) | 6.93 | 13.75 | DNS | DNS | DNS | DNS | DNS | DNS | DNS | DNF | ||||
| align=left | align=left |  | 11.55 (w: 1.3 m/s) | 7.00 | 11.94 | DNS | DNS | DNS | DNS | DNS | DNS | DNS | DNF |
According to an unofficial count, 26 athletes from 17 countries participated in the event.