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.
The current rules for the award (which had for many years been specified only in the minimalist "Jack Herman constitution") were developed in 2000 and 2001 as a result of controversy resulting from the withdrawal of the works of several prominent writers from eligibility, and the rules are subject to revision by the "Business Meeting" of the Natcon.