| Advanced European Theatre of Operations | 2002 | Douglas Niles | Decision Games | War | | BoardGameGeek-INFO (EN), BoardGameGeek-INFO (EN), EFUN-ORDER (EN), EZ (EN) | 10.01.07 | | |
| Alzo Zero: Operation Overlord | 2004 | Massimo Torriani | Italeri | War | Alzo Zero | DSPN (DE) | 29.01.08 | 70 | |
| AT 43: Operation Damocles | 2006 | Jérôme Rigal | Rackham / Universal Cards | War | | DSPN (DE) | 12.06.07 | | In print |
| Battlelines - Operation Uranus | 2003 | Jeff Billings | Lost Battalion Games | War | Battlelines | BoardGameGeek-INFO (EN) | 10.01.07 | US$ 30.00 | |
| Breaking into Valhalla: Operations Veritable and Grenade | 2001 | Paul Rohrbaugh | Microgame Design Group
Schutze Games | War | | BoardGameGeek-INFO (EN), EZ (EN) | 10.01.07 | | |
| Combat Operations | | | Bone Games | War | | EZ (EN) | 08.01.07 | | |
| Counter Space: The CGME Space Opera Gameworld | 2002 | Stephan Beal | Countermoves | War | | BoardGameGeek-INFO (EN) | 10.01.07 | | |
| Das Perry Rhodan Spiel: Operation Wega | 1986 | Reiner Müller | Spielkartenfabrik Altenburg GmbH | War | | BoardGameGeek-INFO (EN) | 16.08.07 | | |
| Defiant Russia: Operation Barbarossa, 1941 | 2004 | William Sariego | Avalanche Press Ltd. | War | | BoardGameGeek-INFO (EN) | 09.01.07 | | |
| Doomtrooper: Apocalypse | | | Target Games AB | Board | Doomtrooper | | 09.01.07 | | |
| European Theatre of Operations | | | TSR | War | | EZ (EN), Homepage (EN), Homepage (EN), Homepage (EN) | 10.01.07 | | |
| Games Kit: 4 Co-operative Pencil & Paper Games | 1998 | Jim Deacove | Family Pastimes | Board | | EFUN-ORDER (EN) | 10.01.07 | US$ 3.95 | |
| Memoir 44: Operation Overlord | 2008 | Richard Borg | Days of Wonder | Board | | | 13.11.08 | EUR 20.00 | |
| Opera | 2009 | Hans van Tol | HUCH & friends | Board | | Ludoversum (DE), SpielKult (DE) | 04.01.10 | EUR 37.00 | |
| Operasjon | 1978 | | MB | Board | | EBRIK (EN) | 09.01.07 | | |
| Operation | 1977 | | MB | Board | | EFUN-ORDER (EN), Spielphase (DE) | 10.01.07 | | |
| Operation Apocalypse | | | Histoire & Collections
Vae Victis | War | Vae Victis | EZ (EN) | 10.01.07 | | |
| Operation Badr | 1983 | David Moore | West End Games | War | | EZ (EN) | 10.01.07 | | |
| Operation Cannibal | | | Avalanche Press Ltd. | War | Decisive Battles of World War II | EZ (EN) | 10.01.07 | US$ 29.95 | |
| Operation Condor | 1978 | Ken Broadhurst | World Wide Wargames | War | The Wargamer | BoardGameGeek-INFO (EN), EZ (EN) | 10.01.07 | | |
| Operation Conrad | | | Close Simulations | War | | EZ (EN) | 09.01.07 | | |
| Operation Crusader | 1978 | Frank Chadwick | GDW | War | | BoardGameGeek-INFO (EN), EZ (EN) | 10.01.07 | | |
| Operation Dragon Rouge | 1995 | Randy Moorehead | Simulations Workshop | War | | EZ (EN) | 10.01.07 | | |
| Operation Endgame | 1993 | Thomas M. Kane | Steve Jackson Games | RPG | GURPS | | 10.01.07 | | |
| Operation Felix | | | Decision Games
Strategy and Tactics | War | S&T | EZ (EN) | 10.01.07 | | |
| Operation Grenade | | | SPI
Strategy and Tactics | War | S&T | | 11.01.07 | | |
| Operation Husky | 1979 | | Swedish Game Production
Combat | War | Combat Magazine | EZ (EN) | 09.01.07 | | |
| Operation Just Cause | | | Crunchy Frog Enterprises | Board | | | 09.01.07 | | |
| Operation Konrad | | Perry A. Moore | | War | | EZ (EN) | 10.01.07 | | |
| Operation Market Garden | | Knight | GDW | War | Double Blind | EZ (EN), EZ (EN) | 10.01.07 | | |
| Operation Matador | 1981 | David Shewchuk | Gryphon Graphics | War | | EZ (EN) | 08.01.07 | | |
| Operation Mercury | | | GMT Games Inc. | War | | DAP-ACC (DE), EFUN-ORDER (EN), EZ (EN) | 10.01.07 | | |
| Operation Olympic | 1974 | | SPI
Strategy and Tactics | War | S&T | EZ (EN) | 09.01.07 | | |
| Operation Olympic | 1974 | | SPI | War | | EFUN-ORDER (EN) | 09.01.07 | | |
| Operation Pegasus | | | Task Force Games | War | | EZ (EN) | 10.01.07 | | |
| Operation Sea Lion | | | XTR Corp
Command | War | Command | EZ (EN) | 10.01.07 | | |
| Operation Shock Troop | | | Decision Games
Strategy and Tactics | War | S&T | EZ (EN) | 11.01.07 | | |
| Operation Shoestring | | | GMT Games Inc. | War | | EZ (EN) | 09.01.07 | | |
| Operation Solace | | | XTR Corp
Command | War | Command | EZ (EN) | 11.01.07 | | |
| Operation Spark | | | Clash of Arms Games | War | | EZ (EN) | 10.01.07 | | |
| Operation Typhoon | 1978 | | SPI | War | | EZ (EN) | 10.01.07 | | |
| Operation Veritable | 2000 | Paul Rohrbaugh | | War | | EZ (EN) | 10.01.07 | | |
| Operation Vital Ground | 1999 | Perry A. Moore | | War | | EZ (EN) | 10.01.07 | US$ 10 | |
| Operation Warboard | | Gavin Lyall | Pan | Book | | | 21.01.01 | | |
| Operation Watchtower | | | Multi Man Publishing | War | | EZ (EN), EZ (EN) | 09.01.07 | | |
| Operation World War II | 2009 | Massimo Torriani | Nexus Editrice | Board | | | 13.05.09 | EUR 50.00 | |
| Operations Magazine | | | The Gamers | Magazine | | | 10.01.07 | | |
| Pacific Theatre of Operations | | | TSR | War | | EZ (EN) | 07.01.07 | | |
| Salerno: Operation Avalanche | 1978 | Albert A. Nofi | West End Games | War | | | 10.01.07 | | |
| Sator Arepo Tenet Opera Rotas | 2008 | Enrico Pesce
Federica Rinaldi | Heidelberger Spieleverlag
Post Scriptum
Scribabs | Board | | DCLIQ (DE), DUNKN (DE), H@LL9000 (DE), RPGForen (DE)New, Spielepizza-INFO (DE,IT) | 23.12.09 | EUR 30.00 | In print |
| Space Opera | | | Fantasy Games Unlimited | RPG | | | 10.01.07 | | |
| Tannhäuser: Operation Novgorod | 2008 | William Grosselin
Didier Poli | Heidelberger Spieleverlag | Board | | Ludoversum (DE) | 27.08.09 | EUR 40.00 | |
| Weirder Tales from the Floating Vagabond: A Space Opera | | | Avalon Hill Game Company | RPG | Floating Vagabond | | 10.01.07 | | |
