| Event: | Men's lightweight |
| Championship: | 2019 World Championships |
| Dates: | 17–18 May 2019 |
| Venue: | Manchester Arena |
| Competitors: | 56 |
| Nations: | 55 |
| Gold: | Simone Alessio |
| Gold Nation: | ITA |
| Silver: | Ahmad Abughaush |
| Silver Nation: | JOR |
| Bronze: | Daniel Quesada |
| Bronze Nation: | ESP |
| Bronze2: | Kairat Sarymsakov |
| Bronze2 Nation: | KAZ |
| Prev: | 2017 |
| Next: | 2022 |
See main article: 2019 World Taekwondo Championships.
The men's lightweight is a competition featured at the 2019 World Taekwondo Championships, and was held at the Manchester Arena in Manchester, United Kingdom on 17 and 18 May. Lightweights were limited to a maximum of 74 kilograms in body mass.