| Iaaf: | KOR |
| Fedname: | Korea Association of Athletics Federations |
| Year: | 2003 |
| Games: | World Championships in Athletics |
| Location: | Paris |
| Competitors: | 7 |
| Gold: | 0 |
| Silver: | 0 |
| Bronze: | 0 |
| Previous: | 2001 |
| Next: | 2005 |
South Korea competed at the 2003 World Championships in Athletics from August 23 to 31. A team of 7 athletes was announced in preparation for the competition.
| Athlete | Event | Heats Qualification | Quarterfinals | Semifinals | Final | ||||
|---|---|---|---|---|---|---|---|---|---|
| Time Width Height | Rank | Time Width Height | Rank | Time Width Height | Rank | Time Width Height | Rank | ||
| Lee Bong-Ju | Marathon | 2:10:38 | 11 | ||||||
| Lee Myong-Seung | Marathon | 2:16:46 | 40 | ||||||
| Ji Young-Jun | Marathon | 2:20:21 | 52 | ||||||
| Kim Yi-Yong | Marathon | DNF | |||||||
| Lee Dae-Ro | 20 kilometres walk | DQ | |||||||
| Athlete | Event | Heats Qualification | Quarterfinals | Semifinals | Final | ||||
|---|---|---|---|---|---|---|---|---|---|
| Time Width Height | Rank | Time Width Height | Rank | Time Width Height | Rank | Time Width Height | Rank | ||
| Choi Kyung-Hee | Marathon | 2:43:38 | 53 | ||||||
| Kim Mi-Jung | 20 kilometres walk | DQ | |||||||