| IguanaCon II, the 36th World Science Fiction Convention | |
| Dates: | 30 August–4 September 1978 |
| Filing: | non-profit |
| Attendance: | ~4,700 |
The 36th World Science Fiction Convention (Worldcon), also known as IguanaCon II, was held on 30 August–4 September 1978 at the Hyatt Regency Phoenix, Adams House, Phoenix Convention Center, and Phoenix Symphony Hall in Phoenix, Arizona, United States. Despite the name, this was the first "IguanaCon".
The original committee chairman was Greg Brown, who served for the first eighteen months of the convention committee's existence; he was replaced for the final six months prior to the convention and during the convention itself by Tim Kyger. Gary Farber was the de facto vice-chairman as well as director of operations during the convention.
Attendance was approximately 4,700.
Josef Nesvadba had been announced as the European guest of honor, but he could not get travel papers and so did not attend.