| Event: | Men's 78 kg |
| Games: | 2002 Asian Games |
| Venue: | Gudeok Gymnasium |
| Date: | 11 October 2002 |
| Competitors: | 14 |
| Nations: | 14 |
| Gold: | Oh Seon-taek |
| Goldnoc: | KOR |
| Silver: | Đinh Vương Duy |
| Silvernoc: | VIE |
| Bronze: | Majid Aflaki |
| Bronzenoc: | IRI |
| Bronze2: | Liu Yang |
| Bronzenoc2: | CHN |
| Prev: | 1998 |
| Next: | 2006 |
See main article: Taekwondo at the 2002 Asian Games.
The men's welterweight (−78 kilograms) event at the 2002 Asian Games took place on 11 October 2002 at Gudeok Gymnasium, Busan, South Korea.
A total of 14 men from 14 countries competed in this event, limited to fighters whose body weight was less than 78 kilograms. Oh Seon-taek of South Korea won the gold medal.
All times are Korea Standard Time
| width=220 | Date | width=50 | Time | width=100 | Event |
|---|---|---|---|---|---|
| Friday, 11 October 2002 | 14:00 | Round 1 | |||
| Round 2 | |||||
| Semifinals | |||||
| 19:50 | Final |