| Tournament Name: | 2017 WPA World Nine-ball Juniors Championship |
| Startdate: | 31 October 2017 |
| Enddate: | 3 November 2017 |
| City: | Moscow |
| Country: | Russia |
| Organisation: | WPA |
| Format: | double elimination, single elimination |
| Winner: | Mahkeal Parris (U17) Yip Kin Ling (boys) Chen Chia-hua (girls) |
| Previous: | 2017 |
| Next: | 2019 |
The 2018 WPA World Junior Nine-ball Championships was the 27th hosting of the Junior World Championship in the pool discipline 9-Ball. The event ran from 31 October to 3 November 2018 Moscow, Russia.
Under 19 world champion was Yip Kin Ling from Hong Kong. In the final against his countryman Robbie Capito he won 11–10 against last year's finalist. In the Under 17 age group was won by Mahkeal Parris who won the final against the Norwegian Emil Andre Gangfløt 9–6. In the junior women, Chen Chia-hua won the event, winning 9–5 victory against the South Korean Seo Seoa in the final.
Defending champion were Sanjin Pehlivanović (U17), Fedor Gorst (U19) and Kristina Tkatsch (Junior). Gorst was the only champion to attempt to defend their title. While Pehlivanović now played in the Under 19 category, Tkatsch was due to age no longer eligible.
| Wettbewerb | Gold | Silber | Bronze |
|---|---|---|---|
| U17-Junioren[2] |  Mahkeal Parris |  Emil Andre Gangfløt |  Kristián Mrva |
 Christoffer Lentz | |||
| U19-Junioren[3] |  Yip Kin Ling | Robbie Capito |  Christian Fröhlich |
 Wiktor Zieliński | |||
| U19-Juniorinnen[4] | Chen Chia-hua |  Seo Seoa | April Larson |
 My Nguyen |
All three competitions were first held in the Double-elimination tournament with a Single-elimination tournament from the quarter-finals onwards. The events were all played as winner breaks.