| Event: | Men's lightweight |
| Championship: | 2011 World Championships |
| Dates: | 4–5 May 2011 |
| Venue: | Gyeongju Indoor Stadium |
| Competitors: | 74 |
| Nations: | 74 |
| Gold: | Alireza Nasr Azadani |
| Gold Nation: | IRI |
| Silver: | Patiwat Thongsalap |
| Silver Nation: | THA |
| Bronze: | Ismaël Coulibaly |
| Bronze Nation: | MLI |
| Bronze2: | Rıdvan Baygut |
| Bronze2 Nation: | TUR |
| Prev: | 2009 |
| Next: | 2013 |
See main article: 2011 World Taekwondo Championships.
The Men's lightweight is a competition featured at the 2011 World Taekwondo Championships, and was held at the Gyeongju Gymnasium in Gyeongju, South Korea on May 4 and May 5.
Lightweights were limited to a maximum of 74 kilograms in body mass.