| Iaaf: | KOR |
| Fedname: | Korea Association of Athletics Federations |
| Year: | 2005 |
| Games: | World Championships in Athletics |
| Location: | Helsinki |
| Competitors: | 10 |
| Gold: | 0 |
| Silver: | 0 |
| Bronze: | 0 |
| Previous: | 2003 |
| Next: | 2007 |
South Korea competed at the 2005 World Championships in Athletics from August 6 to 14. A team of 10 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 Jae-hoon | 800 metres | 1:47.90 (SB) | 23 | align=center colspan=4 | did not advance | ||||
| Je In-Mo | Marathon | 2:26:39 | 54 | ||||||
| Cho Keun-Hyung | Marathon | 2:31:59 | 60 | ||||||
| Kim Yi-Yong | Marathon | DNF | |||||||
| Shin Il-Yong | 20 kilometres walk | 1:23:10 (SB) | 16 | ||||||
| Kim Dong-Young | 50 kilometres walk | 4:01:25 (SB) | 16 | ||||||
| Kim Yoo-Suk | Pole vault | No Mark | Did not advance | ||||||
| Athlete | Event | Heats Qualification | Quarterfinals | Semifinals | Final | ||||
|---|---|---|---|---|---|---|---|---|---|
| Time Width Height | Rank | Time Width Height | Rank | Time Width Height | Rank | Time Width Height | Rank | ||
| Oh Jung-hee | Marathon | 2:47:42 | 44 | ||||||
| Kim Mi-jung | 20 kilometres walk | 1:37:01 | 29 | ||||||
| Lee Mi-Young | Shot put | 16.60 | 23 | align=center colspan=2 | did not advance | ||||