| Event: | Men's lightweight |
| Championship: | 2009 World Championships |
| Dates: | 18 October 2009 |
| Venue: | Ballerup Super Arena |
| Competitors: | 82 |
| Nations: | 82 |
| Gold: | Kim Joon-tae |
| Gold Nation: | KOR |
| Gold Variant: | 1997 |
| Silver: | Maxime Potvin |
| Silver Nation: | CAN |
| Bronze: | Mark López |
| Bronze Nation: | USA |
| Bronze2: | Mokdad Ounis |
| Bronze2 Nation: | GER |
| Prev: | 2007 |
| Next: | 2011 |
See main article: 2009 World Taekwondo Championships.
The Men's lightweight competition at the 2009 World Taekwondo Championships was held at the Ballerup Super Arena in Copenhagen, Denmark on 18 October.
Lightweights were limited to a maximum of 74 kilograms in body mass.