'The Ditmar Award (formally the Australian SF ("Ditmar") Award; formerly the "Australian Science Fiction Achievement Award") has been awarded annually since 1969 at the Australian National Science Fiction Convention (the "Natcon") to recognise achievement in Australian science fiction (including fantasy and horror) and science fiction fandom. The award is similar to the Hugo Award but on a national rather than international scale.
'They are named for Martin James Ditmar "Dick" Jenssen, an Australian fan and artist, who financially supported the awards at their inception.' (Source : https://en.wikipedia.org/wiki/Ditmar_Award)
Started in 1969, the awards were named after Martin James (Ditmar) Jenssen, a founding member of the Melbourne Science Fiction Club, who financially supported the award until about 1975.
The Ditmars are awarded at the Australian National Science Fiction Convention.