| ARDA | Variant | Designer | Players |
| cb28 | Aberration I | Fred Davis and Rod Walker | 7 |
| cb29 | Aberration II | Fred Davis and Rod Walker | 7 |
| ca01 | Aberration III (Imperialism XIII) | Rod Walker | 9 |
| ca03 | Aberration III-A | Simon Szykman | 9 |
| cc01 | Aberration IV (9-Man Diplomacy IV) | Rod Walker | 9 |
| cn14 | Aberration V | Rod Walker & Stephen Agar | 9 |
| cn15 | Aberration VI (Judge) | Rod Walker & Nicholas Fitzpatrick | 9 |
| vc03 | Abortion Diplomacy (map missing) | Glenn Overby | 8 |
| cb34 | Abstraction I | Fred Davis | 7 |
| cb30 | Abstraction II | Fred Davis | 7 |
| xr01 | Absurdity Diplomacy | Fred Davis | 6 |
| xr02 | Absurdity Diplomacy II | Fred Davis | 6 |
| rb01 | Active Neutrals | Robert Sacks | 7 |
| cb43 | Advanced Diplomacy | Stephen Swigger | 7 |
| dm03 | Africa | Richard Egan | 5 |
| dm02 | Africa ‘82 | Brian Lorber | 7 |
| dm05 | Africa II | Richard Egan | 5 |
| dm04 | African Diplomacy | Phil Reynolds | 6 |
| dc02 | African Diplomacy II | David Lawler | # |
| gh12 | Age of Discovery | S.W. Nesbitt II | 4-15 |
| ag08 | Age of Pericles | Michael Golbe | 7 |
| cs10 | Age of the Crusades, 1100 | Unknown | 10 |
| rn19 | Air Diplomacy I | Martin Janta-Polczynski | 7 |
| rn08 | Air Diplomacy II | Martin Janta-Polczynski | 7 |
| rn46 | Air Power Diplomacy | Douglas J. Burgoyne | 7 |
| rn44 | Air Units | ??? | 7 |
| rn31 | Air War 1917 | Steve Doubleday | 7 |
| rn35 | Air War Diplomacy | David Staples | 7 |
| rn38 | Airforce Diplomacy | Neil Duncan | 7 |
| rn01 | Air-Sea Diplomacy (Breakthrough Diplomacy II) | Buddy Tretick | 7 |
| ns01 | Alabama Diplomacy | Randolph Bart | 6 |
| um01 | Algernon Diplomacy | Thomas Galloway | |
| rm69 | Algorithmic Diplomacy | Glenn Overby | 7 |
| rb36 | Alias | W. Ives | 7 |
| em01 | Allah Akba’ar | John Robertson | 11 |
| nu01 | All-American Diplomacy | Kyle Johnson and Steve Kirschner | 6 |
| rr19 | Almost Near Utter Chaos | Elmer Hinton | 7 |
| rb122 | Alpha Variant | Libby McAfee | 7 |
| cm08 | Alpine Passage | David Rothery (CE 7) | 7 |
| mi01 | Alternate World Diplomacy | Steve Perrin | 6 |
| mi02 | Alternate World Diplomacy II | Steve Perrin | 5 |
| lr02 | Amazon Diplomacy | Cristiano Corte Restitutti | 7 |
| rb47 | Ambiguity II | Martin Janta-Polczynski | 7 |
| hc11 | Ambition & Empire V | Jeff Kase and Baron Powell | 10 |
| hc12 | Ambition & Empire VI | Alex Ronke, Jeffrey S. Kase, & B.M. Powell | 10 |
| lb01 | America Latina 1821 | Philippe Janssens | 6 |
| nu09 | American Diplomacy | John Armstrong and John Price | 6 |
| gf15 | American Woolworth(“II”) | Mark Coldiron | 5 |
| nu02 | Americana 1860 | Tim Tilson | 5 |
| uu08 | Amoeba | Ken St. Andre and Jimmy Walker | |
| rh01 | Anarchy I | Don Miller (ex “rs01”) | 34 |
| rh02 | Anarchy II | Don Miller (ex “rs17”) | 17 |
| rv08 | Anarchy III | Don Miller | 17 |
| rh03 | Anarchy IV | Lew Pulsipher (ex “rs02”) | 7 |
| rh04 | Anarchy V | Lew Pulsipher (ex “rs03”) | |
| rh05 | Anarchy VI | Lew Pulsipher (ex “rs04”) | |
| rh10 | Anarchy VII | Jeremy Tullett (ex “rs39”) | |
| uu01 | Ancient Empires I | John Boyer | 5 |
| ac01 | Ancient Empires II | John Lipscomb | 7 |
| ac10 | Ancient Empires III | John Lipscomb and Fred Davis | 7 |
| fh08 | Ancient Empires IV | Warner Airey | 4 |
| ap01 | Ancient Hebrew Kingdoms | John Biehl | 4 |
| ac18 | Ancient Mediterranean | Don Hessong | 7 |
| pe01 | Anglo-Saxomacy | Lew Pulsipher | |
| rb102 | Annoyance Diplomacy | Author Unknown | 8 |
| rb02 | Anonymity I and II | Don Miller | 7 |
| rb03 | Anonymity III | Lew Pulsipher | 7 |
| rm01 | Anonymous Diplomacy | John Lovibond | 7 |
| on01 | Antarctica | G. Long | 6 |
| uu02 | Antigone Isles | Doug Hayward | 7 |
| rs41 | Antithesis | Steve Doubleday | 7 |
| en02 | Aotearoa | Derek William | 8 |
| rm52 | Apocalypse 1900 | David Russell | 7 |
| sg08 | Apposition | Paul Willey | 5 |
| em13 | Arab Diplomacy | Roland Isaksson | 8 |
| uu17 | Archipelago I | Joe Chambers and Jon Miller | 6 |
| uu18 | Archipelago II | Martin Draper | 6 |
| pi07 | Ard-Rí | Stuart John Bernard | |
| rn37 | Ariante Razzia (Air Raid) | Francois Budaf | 7 |
| qh10 | Ark Royal Diplomacy I | Rowland Goodman (includes qp05) | 5 |
| qp05 | Ark Royal Diplomacy II | Rowland Goodman (included with qh10) | 9 |
| rb80 | Armistice Diplomacy | Per Westling | 7 |
| rm96 | Arms Merchant Diplomacy | Chris Fawcett | |
| rb22 | Army / Fleet Rules Module | Fred Davis (CE 11) | 7 |
| cc10 | Arpiesse Diplomacy | Simon Szykman | 7 |
| rd27 | Artes’ Blind Diplomacy | Joan C Artes | 7 |
| ea01 | Asian Diplomacy | S. LaTourette and K. Robison | 7 |
| ea02 | Asian Diplomacy II | Phil Reynolds | 7 |
| ea05 | Asian Diplomacy III | David Lawler and Peter Baer | 7 |
| ea06 | Asian Diplomacy IV | by David Lawler, Peter Baer and Pitt Crandlemire | 7 |
| rm59 | Astrological Diplomacy | Gordan Rycroft | 7 |
| oa02 | Atlantica I | Fred Davis | 7 |
| oa03 | Atlantica II | Fred Davis | 7 |
| oa01 | Atlantica III | Fred Davis | 7 |
| oa04 | Atlantica II-R | Fred Davis | 7 |
| oa05 | Atlantica IV | Fred Davis | 8 |
| oa06 | Atlantica IVa | Fred Davis & Stephen Agar | 8 |
| uu20 | Atlantis Time’s Diplomacy | Davide Cleopadre | 5 |
| rn36 | Atomic | Andy Bate | 7 |
| gf14 | Atomic Warfare(“I”) | Will Haven | 9 |
| vj01 | Auction Diplomacy | David Wheeler | 7 |
| rs37 | Aufmarschplan | Ulrich Blennemann | 7 |
| rs38 | Aufrustung | Ulrich Blennemann | 7 |
| od03 | Australia and Pacific Variant | Larry Peery | 5 |
| rx19 | Autarchy | Steven Jilks | 2 |
| rv19 | Axis & Allies Meets Diplomacy | by Lexi Pimenidis | 7 |
| nm01 | Aztlan | Ken St. Andre | |