The Ditmar Award is Australia's oldest and best-known science fiction, fantasy and horror award, presented annually since 1969, usually at the Australian "Natcon". The historical nominations and results (listed in boldface) of the Award follow.

1969: Eighth Australian Science Fiction Convention, Melbourne

Best Australian Science Fiction of any length, or collection

Best International Science Fiction of any length, or collection

Best Contemporary Writer of Science Fiction

Best Australian Amateur Science Fiction Publication or Fanzine

1970: Ninth Australian Science Fiction Convention, Melbourne

Best Australian Science Fiction

Best International Publication

Best International Fiction

Best Australian Fanzine

1971: Tenth Australian Science Fiction Convention, Melbourne

Best Australian SF

Best International Fiction

Best Australian Fanzine

Special Awards

1972: Syncon 2, Sydney

Best Australian Fiction

Best International Fiction

Best Australian Fanzine

1973: Advention 2, Adelaide

Best Australian Fiction

Best International Fiction

Best Dramatic Presentation

Best Australian Fanzine

1974: Ozcon, Melbourne

(The programme book for the 1990 Natcon, Danse Macabre, records that no Ditmar Awards were presented in 1974.)

No Ditmar Awards

1975: Syncon '75, Sydney

Best Australian SF

Best International Fiction

Best Australian Fanzine

1976: Bofcon, Melbourne

Best Australian Fiction

Best International Fiction

Best Australian Fanzine

William Atheling Jr Award

1977: A-Con 7, Adelaide

Best Australian Science Fiction

Best International Fiction

Best Australian Fanzine

William Atheling Award

Special committee award

1978: Unicon IV, Melbourne

Australian Science Fiction, Best Novel

Australian Science Fiction, Best Short Fiction

Best International Fiction

Best Amateur Australian Publication (Fanzine)

William Atheling Jr Award

1979: Syncon '79, Sydney

Best Australian Fiction

Best International Fiction

Best Australian Fanzine

Best Australian Fanwriter

William Atheling Jr Award

1980: Swancon 5, Perth

Australian fiction

Best International Fiction

Best Australian Fanzine

Best Australian Fan Writer

Best Australian SF or Fantasy Artist

William Atheling Award for Criticism in SF or Fantasy

1981: Advention '81, Adelaide

Best Australian Novel

Best Australian Short Fiction

Best International Fiction

Best Australian Fanzine

Best Australian Fanwriter

Best Australian SF or Fantasy Artist

William Atheling Jr Award

1982: Tschaicon, Melbourne

(The Australian newszine Thyme records that Tschaicon was the "First Australasian Science Fiction Convention", the relevant constitution having had "Australian" replaced with "Australasian" throughout; that the award categories used "Australasian" rather than "Australian"; and that the constitution was modified, at Tschaicon, to have "Australasian" changed back to "Australian".) There was an award from the committee, in the form of a miniature Ditmar Award, to Marc Ortlieb for Best Toastmastering.

Best Long Australasian Science Fiction or Fantasy

Best Short Australasian Science Fiction or Fantasy

Best International Fiction

Best Australasian Fanzine

Best Australasian Fan Writer

Best Australasian SF or Fantasy Artist

William Atheling Award

1983: Syncon '83, Sydney

Best Australian Science Fiction or Fantasy

Best International Science Fiction or Fantasy

Best Australian Fanzine

Best Australian Fanwriter

Best Australian SF or Fantasy Artist

Best Australian SF or Fantasy Cartoonist

Best Australian SF or Fantasy Editor

William Atheling Award (for critical writings)

Special Award

1984: Eureka!con, Melbourne

There were insufficient nominations for the William Atheling Jr Award.

Best Australian Long Science Fiction or Fantasy

Best Australian Short Science Fiction or Fantasy

Best International Fiction

Best Australian Fanzine

Best Australian Fanwriter

Best Australian SF or Fantasy Artist

Best Australian SF or Fantasy Cartoonist

Best Australian SF or Fantasy Editor

1985: Advention '85, Adelaide

The awards ceremony included presentation of the A. Bertram Chandler Award to Lee Harding, and another three special awards to Damien Broderick, for Transmitters; John Foyster, for past work in fandom; and the Nova Mob, for going on for a long time. (The A. Bertram Chandler Award is a separate award. )

Best Australian Novel

Best Australian Short Fiction

Best International Fiction

Best Australian Fanzine

Best Australian Fanwriter

Best Australian SF or Fantasy Artist, Cartoonist or Illustrator

Best Australian SF or Fantasy Editor

Best Australian SF or Fantasy Dramatic Presentation

William Atheling Jr Award

1986: Swancon XI, Perth

Best Australian Science Fiction Novel

Best Australian Short Fiction

Best International Fiction

Best Australian Fanzine

Best Australian Fanwriter

Best Australian SF or Fantasy Artist

William Atheling Jr Award

1987: Capcon, Canberra

Best Australian Science Fiction or Fantasy Novel

Best Australian Science Fiction or Fantasy Short Fiction

Best Australian Fanzine

Best Australian SF or Fantasy Artist

Outstanding Contribution to Australian Fandom

William Atheling Jr Award for Criticism or Review

1988: Conviction, Sydney

Best Australian Long Fiction

Best Australian Short Fiction

Best Australian Fanzine

Best Australian Fan Writer

Best Fan Artist

William Atheling Jr Award for Criticism or Review

1989: Swancon 14, Perth

Best Australian Long Fiction

Best Australian Short Fiction

Best International Fiction

Best Australian Fanzine

Best Australian Fanwriter

Best Fan Artist

William Atheling Jr Award

1990: Danse Macabre, Melbourne

Best Australian Long Fiction

Best Australian Short Fiction

Best Australian Fanzine

Best Australian Fanwriter

Best Fan Artist

1991: Suncon, Brisbane

Best Fannish Cat

Best Fanzine

Best Australian Novel or Anthology

Best Australian Short Fiction

Best Australian Fan Artist

Best Australian Fan Writer

William Atheling Jr Award

1992: Syncon, Sydney

The awards ceremony included presentation of five special awards from the Syncon committee to Jack R. Herman, Eric B. Lindsay, Ron Clarke, Sue Clarke, and Shayne McCormack.

Best Novel or Collection

Best Short Fiction

Best Fanzine

Best Fan Writer

Best Artist

William Atheling Jr Award for Criticism or Review

1993: Swancon 18, Perth

Best Long Fiction

Best Short Fiction

Best Periodical

Best Fan Writer

Best Artwork

William Atheling Jr Award

1994: Constantinople, Melbourne

Best Long Fiction or Collection

Best Short Fiction

Best Professional Art Work

Best Fan Writer

Best Fan Artist

Best Fanzine

William Atheling Jr Award

1995: Thylacon, Hobart

Best Australian Long Fiction

Best Australian Short Fiction

Best Professional Artwork

Best Fanzine

Best Fan Writer

Best Fan Artist

Special Committee Award

1996: Swancon 21, Perth

Best Long Fiction

Best Short Fiction

Best Publication/Fanzine (Periodical)

Best Artwork

Best Non-Professional/Fan Writer

Best Non-Professional/Fan Artist

William Atheling Jnr Award

1997: Basicon 2, Melbourne

Best Australian Long Fiction

Best Australian Short Fiction

Best Fanzine

Best Fan Writer

Best Fan Artist

Best Professional Artwork

William Atheling Jr. Award for Criticism or Review

1998: Thylacon II, Hobart

Best Long Fiction

Best Short Fiction

Best Dramatic Presentation

Best Artwork/Artist

Best Fanzine

Best Fan Writer

William Atheling Jr Award

1999: Spawncon II, Melbourne

Best Australian Long Fiction

Best Australian Short Fiction

Best Australian Magazine or Anthology

Best Australian Fanzine

Best Australian Fan Artist

Best Australian Professional Artwork

William Atheling Jr. Award

2000: Swancon 2000, Perth

An awards ceremony was held 16 December 2000; the actual trophies were presented later at Swancon 2001.

Best Written Work (Professional)

Best Written Work (Unpaid or Fan)

Best Professional Production in Any Medium

Best Non-Professional Production in Any Medium

Best Artwork (Professional.)

Best Artwork (Unpaid or Fan)

William Atheling Award for Criticism or Review

Best Novel

Best Short Fiction

Best Collected Work

Best Artwork

Best Fan Writer

Best Fan Artist

Best Fan Production

William Atheling Jr. Award

2001: Swancon 2001: Masquerade, Perth

Best Novel

Best Short Fiction

Best Collected Work

Best Artwork

Best Fan Writer

Best Fan Artist

Best Fan Production

William Atheling Jr Award for Criticism and Review

Best New Talent

Best Professional Achievement

Two items ruled ineligible; category withdrawn

2002: Convergence, Melbourne

Best Australian Novel

Best Australian Short Fiction

Best Australian Collected Work

Best Fan Writer

Best Fan Artist

Best Australian Fan Production, Fanzine

Best Australian Fan Production, Other

Best Australian Professional Achievement

Best New Talent

2003: Swancon 2003, Perth

Best Australian Novel

Best Australian Short Fiction

Best Australian Collected Work

Best Australian Artwork

Best Australian Fan Writer

Best Australian Fan Artist

Best New Talent

Best Australian Fanzine

Best Australian Production

Best Australian Professional Achievement

Best Australian Fan Achievement

The William Atheling Jr Award for Criticism or Review

2004: Conflux, Canberra

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Fan Production

Best Fanzine

Best Fan Writer

Best Fan Artist

Best Artwork

Best New Talent

William Atheling Jr. Award

2005: Thylacon 2005, Hobart

Best Novel

Best Collected Work

Best Novella or Novelette

Best Short Story

Best Professional Artwork

Best Professional Achievement

Best Fan Achievement

Best Fan Artist

Best Fan Website/Zine

Best Fan Writer

Best New Talent

William Atheling Jnr. Award for Criticism or Review

2006: Conjure, Brisbane

Best Novel

Best Collected Work

Best Novella or Novelette

Best Short Story

Best Professional Artwork

Best Professional Achievement

Best Fan Production

Best Fan Artist

Best Fanzine/website

Best Fan Writer

Best New Talent

The William Atheling Jr. Award

2007: Convergence 2, Melbourne

Best Novel

Best Novella/Novelette

Best Short Story

Best Collected Work

Best Artwork/Artist

Best Fan Writer

Best Fan Artist

Best Fan Production

Best Fanzine

Best Professional Achievement

Best Fan Achievement

Best New Talent

William Atheling Jr Award

2008: State of the Art: Swancon 2008, Perth

Best Novel

Best Novella/Novelette

Best Short Story

Best Collected Work

Best Artwork/Artist

Best Fan Writer

Best Fan Art

Best Fan Production

Best Fanzine

Best Professional Achievement

Best Fan Achievement

Best New Talent

William Atheling Jr Award

2009: Conjecture, Adelaide

Best Novel

Best Novella/Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Writer

Best Fan Artist

Best Fan Publication in Any Medium

Best Achievement

Best New Talent

William Atheling Jr Award

2010: Dudcon III, Melbourne

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Writer

Best Fan Artist

Best Fan Publication in Any Medium

Best Achievement

Best New Talent

William Atheling Jr Award for Criticism or Review

There was a version of the ballot on which the cover design by Lisa L. Hannett for The Girl With No Hands was nominated as cover art under Best Artwork. When it was reclassified as cover design under Best Achievement, cover art by Andrew J. McKiernon for Savage Menace and Other Poems of Horror got onto the ballot under Best Artwork.

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Writer

Best Fan Artist

Best Fan Publication in Any Medium

Best Achievement

Best New Talent

William Atheling Jr Award for Criticism or Review

2012, Continuum 8: Craftonomicon, Melbourne

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Writer

Best Fan Artist

Best Fan Publication in Any Medium

Best New Talent

William Atheling Jr. Award for Criticism or Review

2013, Conflux 9, Canberra

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Writer

Best Fan Artist

Best Fan Publication in Any Medium

Best New Talent

William Atheling Jr Award for Criticism or Review

2014, Continuum X, Melbourne

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Writer

Best Fan Artist

Best Fan Publication in Any Medium

Best New Talent

William Atheling Jr Award for Criticism or Review

2015, Swancon 40, Perth

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Writer

Best Fan Artist

Best Fan Publication in Any Medium

Best New Talent

William Atheling Jr Award for Criticism or Review

2016, Contact2016, Brisbane

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Publication in any Medium

Best Fan Writer

Best Fan Artist

Best New Talent

William Atheling Jr. Award for Criticism or Review

2017: Continuum 13, Melbourne

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Writer

Best Fan Artist

Best Fan Publication in Any Medium

Best New Talent

William Atheling Jr Award for Criticism or Review

2018: Swancon 2018, Perth

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Publication in any Medium

Best Fan Writer

Best Fan Artist

Best New Talent

William Atheling Jr. Award for Criticism or Review

2019: Continuum 15, Melbourne

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Publication in Any Medium

Best Fan Writer

Best New Talent

William Atheling Jr Award for Criticism or Review

2020: Swancon 2020, Perth

(The convention was cancelled.) There were insufficient nominations for the Best Artwork and Best Fan Artist categories. There was a preliminary ballot on which Bruce Gillespie was nominated for Best Fan Writer "for writing in SF Commentary and ANZAPA articles".

Best Novel

Best Short Fiction

Best Collected Work

Best Fan Publication in Any Medium

Best Fan Writer

Best New Talent

William Atheling Jr. Award for Criticism or Review

2021: Conflux, Canberra

(The convention was cancelled.)

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Artwork

Best Fan Publication in Any Medium

Best Fan Writer

Best Fan Artist

Best New Talent

William Atheling, Jr. Award for Criticism or Review

Some categories had more than five nominees due to ties, and some had fewer due to insufficient nominations.

2022: Conflux 16, Canberra

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Fan Publication in Any Medium

Best Fan Writer

Best Fan Artist

William Atheling, Jr. Award for Criticism or Review

2023: Conflux 17, Canberra

Results of the preliminary ballot were declared in August, with the winners announced on 30 September 2023:

Best Novel

Best Novella or Novelette

Best Short Story

Best Collected Work

Best Fan Publication in Any Medium

Best Fan Writer

Best Fan Artist

Best New Talent

William Atheling, Jr. Award for Criticism or Review