| Event: | Men's kumite 84 kg |
| Championship: | 2021 World Karate Championships |
| Dates: | 16–20 November |
| Venue: | Hamdan Sports Complex |
| Location: | Dubai, United Arab Emirates |
| Competitors: | 70 |
| Nations: | 70 |
| Gold: | Youssef Badawy |
| Gold Nation: | EGY |
| Silver: | Fabián Huaiquimán |
| Silver Nation: | CHI |
| Bronze: | Yuta Mori |
| Bronze Nation: | JPN |
| Bronze2: | Jessie Da Costa |
| Bronze2 Nation: | FRA |
| Prev: | 2018 |
| Next: | 2023 |
The Men's 84 kg competition at the 2021 World Karate Championships was held from 16 to 20 November 2021.[1]