| 2018 BWF World Junior Championships Boys' Singles | |
| Dates: | – |
| Number Edition: | 20th |
| Level: | 1 |
| Venue: | Markham Pan Am Centre |
| Location: | Markham, Canada |
| Previous: | 2017 |
| Next: | 2019 |
The boys' singles of the tournament 2018 BWF World Junior Championships was held on 12–18 November. The defending champions of the last edition is Kunlavut Vitidsarn from Thailand.[1]
See also: 1 and 1. 
Kunlavut Vitidsarn (champion)
See also: 2 and 8. Ikhsan Rumbay (fourth round)
See also: 3 and 6. 
Li Shifeng (semifinals)
See also: 4 and 3. 
Lakshya Sen (semifinals)
See also: 5 and 2. 
Arnaud Merklé (third round)
See also: 6 and 5. 
Nhat Nguyen (quarterfinals)
See also: 7 and 4. Bai Yupeng (second round)
See also: 8 and 7. 
Jason Teh (third round)
See also: 9 and 3. Chen Shiau-cheng (fourth round)
See also: 10 and 7. Christopher Grimley (first round)
See also: 11 and 5. 
Julien Carraggi (second round)
See also: 12 and 2. Alberto Alvin Yulianto (quarterfinals)
See also: 13 and 8. Lukas Resch (third round)
See also: 14 and 4. 
Brian Yang (third round)
See also: 15 and 1. Joel Koh (second round)
See also: 16 and 6. 
Danylo Bosniuk (third round)