The Junior World Championships are held from July 9 – 13 in Kazan, Russia. 32 nations and 242 athletes are scheduled to compete.
This list was last updated on July 7 after publication of the final entry forms received by the organizing committee. The detailed breakdown for each event was not available for some nations, and are thus left blank. We will publish the start lists as soon as they are available and we will have the definite number of routines per event then.
| Nation | # of Athletes | Solo | Duet | Team | Free Combination |
| Australia | 12 | ||||
| Belarus | 8 | X | X | X | |
| Canada | 10 | X | X | X | |
| Chile | 3 | ||||
| China | 12 | X | X | X | |
| Colombia | 3 | ||||
| Egypt | 12 | ||||
| France | 5 | X | X | ||
| Germany | 12 | X | X | X | X |
| Greece | 12 | X | X | X | X |
| Hungary | 10 | X | X | X | X |
| Israel | 2 | X | X | ||
| Italy | 12 | X | X | X | X |
| Japan | 12 | X | X | X | X |
| Liechtenstein | 2 | X | X | ||
| Macau | 4 | X | X | ||
| Malaysia | 1 | X | |||
| Mexico | 11 | X | X | X | X |
| Netherlands | 2 | X | |||
| New Zealand | 2 | X | |||
| Peru | 1 | ||||
| Russia | 12 | X | X | X | X |
| San Marino | 2 | X | X | ||
| Slovakia | 2 | X | X | ||
| South Africa | 12 | X | X | X | |
| Spain | 12 | X | X | X | X |
| Switzerland | 12 | X | X | X | X |
| Turkey | 4 | ||||
| Ukraine | 12 | X | X | X | X |
| United States of America | 12 | X | X | X | X |
| Uzbekistan | 10 | X | X | X | X |
| Venezuela | 1 | ||||
| Total | 242 | 22 | 23 | 16 | 14 |