28th World Science Fiction Convention

Heicon '70, the 28th World Science Fiction Convention
The venue for the event, the Heidelberg Stadthalle
GenreScience fiction
Dates20–24 August 1970
VenueStadthalle Heidelberg
Location(s)Heidelberg
CountryWest Germany
Attendance~620
Filing statusnon-profit

The 28th World Science Fiction Convention (Worldcon), also known as Heicon '70, was held on 20–24 August 1970 at the Stadthalle Heidelberg in Heidelberg, West Germany.

Manfred Kage eventually became Heicon's convention chairman, the last of more than a dozen fans who briefly held the position during the convention's rocky organizational period.