| Conspiracy '87, the 45th World Science Fiction Convention | |
| Dates: | 27 August–1 September 1987 |
| Filing: | non-profit |
| Attendance: | 4,009 |
The 45th World Science Fiction Convention (Worldcon), also known as Conspiracy '87, was held on 27 August–1 September 1987 at the Metropole Hotel and The Brighton Centre in Brighton, United Kingdom.
The initial chairman was Malcolm Edwards, who had to scale back his involvement several months before the con, and was succeeded by Paul Oldroyd with the title of "coordinator", later recognised as chairman.
Attendance was 4,009, out of 5,425 paid memberships.