| Event: | Men's singles |
| Championship: | 2018 BWF World Championships |
| Dates: | 30 July – 5 August |
| Venue: | Nanjing Youth Olympic Sports Park Indoor Arena |
| Location: | Nanjing, China |
| Gold: | Kento Momota |
| Gold Nation: | JPN |
| Silver: | Shi Yuqi |
| Silver Nation: | CHN |
| Bronze: | Chen Long |
| Bronze Nation: | CHN |
| Bronze2: | Liew Daren |
| Bronze2 Nation: | MAS |
| Prev: | 2017 Glasgow |
| Next: | 2019 Basel |
The men's singles tournament of the 2018 BWF World Championships (World Badminton Championships) took place from 30 July to 5 August.
The seeding list is based on the World Rankings from 12 July 2018.[1]
See also: 1 and 1. Viktor Axelsen (quarterfinals)
See also: 2 and 4. Lee Chong Wei (withdrew)
See also: 3 and 2. 
Shi Yuqi (final)
See also: 4 and 3. 
Son Wan-ho (withdrew)
See also: 5 and 4. 
Srikanth Kidambi (third round)
See also: 6 and 3. 
Kento Momota (champion)
See also: 7 and 2. Chou Tien-chen (quarterfinals)
See also: 8 and 1. Chen Long (semifinals)
See also: 9 and 2. Lin Dan (third round)
See also: 10 and 1. 
Ng Ka Long (third round)
See also: 11 and 2. Prannoy Kumar (second round)
See also: 12 and 4. Anthony Sinisuka Ginting (second round)
See also: 13 and 4. Jonatan Christie (first round)
See also: 14 and 1. Kenta Nishimoto (third round)
See also: 15 and 3. Tommy Sugiarto (second round)
See also: 16 and 3. Anders Antonsen (third round)