| Iaaf: | JPN |
| Fedname: | Japan Association of Athletics Federations |
| Year: | 2013 |
| Games: | World Championships in Athletics |
| Location: | Moscow |
| Competitors: | 44 (men: 32; women: 12) |
| Gold: | 0 |
| Silver: | 0 |
| Bronze: | 1 |
| Previous: | 2011 |
| Next: | 2015 |
Japan sent 41 athletes to the 14th IAAF World Championships in Moscow, Russia. The Japan team were announced by the Japan Association of Athletics Federations after the 2013 Japan Championships in Athletics.
| Event | Athletes | ||
|---|---|---|---|
| Men | Women | ||
| Sprint | Ryota Yamagata Yoshihide Kiryu Shota Iizuka Yuichi Kobayashi Kei Takase Kenji Fujimitsu Yuzo Kanemaru | Chisato Fukushima | |
| Distance | Yuki Sato Suguru Osako Tsuyoshi Ugachi | Misaki Onishi Hitomi Niiya | |
| Hurdle | Takayuki Kishimoto Yasuhiro Fueki Takatoshi Abe | Hitomi Shimura Satomi Kubokura | |
| Mile Relay | Yuzo Kanemaru Kengo Yamazaki Hiroyuki Nakano Hideyuki Hirose | - | |
| Marathon | Kazuhiro Maeda Hiroyuki Horibata Yuki Kawauchi Masakazu Fujiwara Kentaro Nakamoto | Ryoko Kizaki Kayoko Fukushi Mizuki Noguchi | |
| Race walking | Yusuke Suzuki Takumi Saito Takayuki Tanii Hirooki Arai Koichiro Morioka | Masumi Fuchise Kumi Otoshi | |
| Event | Athletes | ||
|---|---|---|---|
| Men | Women | ||
| Jumping | Seito Yamamoto Daichi Sawano Hiroki Ogita | Miyuki Fukumoto | |
| Throwing | Koji Murofushi Yukifumi Murakami | Yuki Ebihara | |
| Combined event | Keisuke Ushiro | - | |
| Athlete | Event | Preliminaries | Heats | Semifinals | Final | ||||
|---|---|---|---|---|---|---|---|---|---|
| Time | Rank | Time | Rank | Time | Rank | Time | Rank | ||
| Chisato Fukushima | 200 metres | 23.85 | 37 | align=center colspan= 4 | Did not advance | ||||
| Misaki Onishi | 5000 metres | 16:16.52 | 19 | align=center colspan= 4 | Did not advance | ||||
| Hitomi Niiya | 10,000 metres | 30:56.70 | 5 | ||||||
| Hitomi Shimura | 13.72 | 34 | align=center colspan= 4 | Did not advance | |||||
| Satomi Kubokura | 400 | 56.33 | 16:16.52 | align=center colspan= 4 | Did not advance | ||||
| Kayoko Fukushi | 2:27:45 | ||||||||
| Ryoko Kizaki | 2:31:28 | 4th | |||||||
| Mizuki Noguchi | align=center colspan= 2 | DNF | |||||||
| Kumi Otoshi | 20 kilometres walk | 1:32:44 | 26th | ||||||
| Masumi Fuchise | 20 kilometres walk | 1:33:13 | 28th | ||||||
| Athlete | Event | Qualification | Final | |||
|---|---|---|---|---|---|---|
| Distance | Position | Distance | Position | |||
| Yuki Ebihara | Javelin | 59.80 | 16 | did not advance | ||
| Miyuki Fukumoto | High Jump | 1.78 | 27 | did not advance | ||