| NyCon 3, the 25th World Science Fiction Convention | |
| Dates: | 31 August–4 September 1967 |
| Filing: | non-profit |
| Attendance: | ~1,500 |
The 25th World Science Fiction Convention (Worldcon), also known as NyCon 3 or Nycon 3, was held on 31 August–4 September 1967 at the Statler Hilton Hotel in New York City, United States.
The chairmen were Ted White and Dave Van Arnam.
Attendance was approximately 1,500.