| WPA World 9-Ball Championship 2004 | |
| Location: | Taipei, Taiwan |
| Start Date: | July 10, 2004 |
| End Date: | July 18, 2004 |
| Sport: | 9-ball |
| Runner-Up1: | Chang Pei-Wei |
| Tournament Format: | Round robin / Single Elimination |
| Host: | WPA World Nine-ball Championship |
| Participants: | 128 |
| Champion: |  Alex Pagulayan |
| Previous: | 2003 |
| Next: | 2005 |
The 2004 WPA World Nine-ball Championship was the 15th edition of the WPA World Championship for 9-Ball Pool. It took place from July 10 to 18, 2004 in the Taiwanese capital city Taipei.
Filipino Alex Pagulayan won the championship with a 17–13 victory in the final against Taiwanese Chang Pei-Wei . Defending champion Thorsten Hohmann dropped out in the round of 32 against Kang Chin-ching from Chinese Taipei.
The 128 participating players were divided into 16 groups, in which they competed in round robin mode against each other. The top four players in each group qualified for the final round played in the knockout system, featuring the remaining 64 players.
The following players exited the competition in the group stage:
| 5. Place | 6. Place | 7. Place | 8. Place | ||
|---|---|---|---|---|---|
| Group 1: |  |  Giovanni Orozco | |||
| Group 2: |  Alok Kumar |  Corey Harper | |||
| Group 3: |  |  David Reljic | |||
| Group 4: |  Gustavo Espinosa | ||||
| Group 5: |  Al Logan | ||||
| Group 6: | Anthony Ginn | ||||
| Group 7: | Steve Lillis | ||||
| Group 8: |  |  Richard Wolff | |||
| Group 9: |  Kamarudin Yudharman | ||||
| Group 10: | Kevin Hew | ||||
| Group 11: |  | Siauw Wieto | |||
| Group 12: | Kevin Smith |  David Anderson | |||
| Group 13: |  Gabriel Carral | ||||
| Group 14: |  |  Lee Jang-su | |||
| Group 15: | | |  Sascha Trautmann | ||
| Group 16: |  |  Surathep Phoochalam |