| 2018 BWF World Junior Championships Mixed Doubles | |
| Dates: | – |
| Number Edition: | 20th |
| Level: | 1 |
| Venue: | Markham Pan Am Centre |
| Location: | Markham, Canada |
| Previous: | 2017 |
| Next: | 2019 |
The mixed doubles of the tournament 2018 BWF World Junior Championships was held on 12–18 November. The defending champions from the last edition are Rinov Rivaldy / Pitha Haningtyas Mentari from Indonesia.[1]
See also: 1 and 1. 
Guo Xinwa / Liu Xuanxuan (third round)
See also: 2 and 8. Rehan Naufal Kusharjanto / Siti Fadia Silva Ramadhanti (final)
See also: 3 and 3. Pramudya Kusumawardana / Ribka Sugiarto (quarterfinals)
See also: 4 and 6. Ghifari Anandaffa Prihardika / Lisa Ayu Kusumawati (quarterfinals)
See also: 5 and 7. Di Zijian / Li Yijing (second round)
See also: 6 and 2. 
Fabricio Farias / Jaqueline Lima (second round)
See also: 7 and 5. 
Fabien Delrue / Juliette Moinard (fourth round)
See also: 8 and 4. Shang Yichen / Zhang Shuxian (semifinals)
See also: 9 and 5. 
Wang Chan / Jeong Na-eun (semifinals)
See also: 10 and 4. 
Hiroki Midorikawa / Natsu Saito (fourth round)
See also: 11 and 1. William Villeger / Sharone Bauer (third round)
See also: 12 and 7. 
Weeraphat Phakrajung / Chasinee Korepap (second round)
See also: 13 and 6. Maxime Briot / Ainoa Desmons (second round)
See also: 14 and 8. Wessel van der Aar / Alyssa Tirtosentono (second round)
See also: 15 and 2. 
Bruno Barrueto Deza / Fernanda Saponara Rivva (second round)
See also: 16 and 3. Shin Tae-yang / Lee Jung-hyun (fourth round)