13th World Science Fiction Convention
| Clevention, the 13th World Science Fiction Convention | |
|---|---|
| Genre | Science fiction | 
| Dates | 2–5 September 1955 | 
| Venue | Manger Hotel | 
| Location(s) | Cleveland, Ohio | 
| Country | United States | 
| Attendance | ~380 | 
| Filing status | non-profit | 
The 13th World Science Fiction Convention (Worldcon), also known as Clevention, was held on 2–5 September 1955 at the Manger Hotel in Cleveland, Ohio, United States.
The chairmen were Nick and Noreen Falasca. The guests of honor were Isaac Asimov (pro) and Sam Moskowitz (mystery GoH).