| Philcon I, the 5th World Science Fiction Convention | |
| Venue: | Penn-Sheraton Hotel |
| Dates: | 30 August–1 September 1947 |
| Attendance: | ~200 |
The 5th World Science Fiction Convention (Worldcon), also known as Philcon I, was held on 30 August–1 September 1947 at the Penn-Sheraton Hotel in Philadelphia, Pennsylvania, United States.
The chairman was Milton Rothman.
Attendance was approximately 200.