19th World Science Fiction Convention
| Seacon, the 19th World Science Fiction Convention | |
|---|---|
| Genre | Science fiction | 
| Dates | 2–4 September 1961 | 
| Venue | Hyatt House Hotel | 
| Location(s) | Seattle, Washington | 
| Country | United States | 
| Attendance | 270 to 300 | 
| Filing status | Non-profit | 
The 19th World Science Fiction Convention (Worldcon), also known as Seacon, was held on 2–4 September 1961 at the Hyatt House Hotel in Seattle, Washington, United States.
The convention chair was Wally Weber.