22nd World Science Fiction Convention
| Pacificon II, the 22nd World Science Fiction Convention | |
|---|---|
| Genre | Science fiction | 
| Dates | 4–7 September 1964 | 
| Venue | Hotel Leamington | 
| Location(s) | Oakland, California | 
| Country | United States | 
| Attendance | ~523 | 
| Filing status | Non-profit | 
The 22nd World Science Fiction Convention (Worldcon), also known as Pacificon II, was held on 4–7 September 1964 at the Hotel Leamington in Oakland, California, United States.
Pacificon was combined with Westercon, the annual West Coast Science Fantasy Conference, sharing guests of honor and chairmen. The chairmen were J. Ben Stark and Al haLevy.