| Event: | Men's 66 kg |
| Championship: | 2010 World Judo Championships |
| Location: | Tokyo, Japan |
| Gold: | Junpei Morishita |
| Gold Value: | 1 |
| Goldnoc: | JPN |
| Silver: | Leandro Cunha |
| Silvernoc: | BRA |
| Bronze: | Khashbaataryn Tsagaanbaatar |
| Bronzenoc: | MGL |
| Bronze2: | Loic Korval |
| Bronzenoc2: | FRA |
The Men's -66 kg competition at the 2010 World Judo Championships was held at 12 September at the Yoyogi National Gymnasium in Tokyo, Japan. 82 competitors contested for the medals, being split in 4 Pools where the winner advanced to the medal round.
Andreas Krassas 000 vs. 
Miloš Mijalković 111
Musa Mogushkov 112 vs. Levar Arthur 000
Junpei Morishita 100 vs. 
Ulugbek Norkobilov 000
Ruslan Uulu 100
Tomasz Kowalski 001 vs. 
Sasha Mehmedovic 000
Sergey Lim 000 vs. Deniss Kozlovs 100
Ivo dos Santos 100 vs. 
Bruno Luzia 000
Sergiy Pliyev 002 vs. Islam Baialinov 000
Wen Dusu 100 vs. 
Amornthep Namwiset 000
Kenneth Hashimoto 010 vs. 
Farukhruz Sobirov 000