Ahem, since you didn't specify videogame. Memoir '44 and Flames of War are fucking amazing tabletops.
In terms of VIDEO GAMES, Wolfenstein series is fucking amazing WW2 FPS with fictional additions such as magic. Men of War, Blitzkrieg and Company of Heroes are amazing RTS, Men of War being the most realistic, focusing on individual soldiers and combat rather than base building, Blitzkrieg being in the middle and Company of Heroes being very arcade oriented. RUSE is a great, unique RTS, definitely worth a try. IL-2 Sturmovik is an absolutely fucking amazing WW2 flight sim, I would go so far as to say it is my favorite flight sim. Medal of Honor: Airborne is a fucking fantastic, fairly recent Medal of Honor and has an absolutely badass campaign. Blazing Angels is an arcade flight game which is also very good. Battlefield 1942 is a squad based FPS with vehicle combat and is free on Origin, but it definitely shows it's age. Commandos is a really cool action RTS series, but it too, shows it's age. Red Orchestra 2 and Rising Storm are very good, but aren't very populated, and single player is very low par. The Saboteur is a great Assassin's Creed esque underground sabotage game, but like Wolfenstein, it throws historical accuracy out the window. Sniper Elite is a good series, but the original is infinitely better, even today, the modern one is too linear and holds your hand a lot, not to mention the AI is actually smarter in the old one. Brothers in Arms is a great squad based singleplayer FPS experience, and in fact, Brothers in Arms: Hell's Highway was the first game and only, to make me shed a tear, the series' stories are some of the industries best. Day of Defeat is a fast paced Source FPS, I don't like it much, but many people love it, and it's community is still large. Iron Front Liberation is a WW2 online game based off the Arma 2 engine, very fun. Making History 1 is a great WW2 grand strategy game, faster paced than the Paradox ones, incredibly entertaining with friends. The Hearts of Iron series are slow paced grand strategy games, but have incredible amounts of depth. And lastly, one of my favorite WW2 series and incredibly underrated games, Battlestations, which gets you balls deep into the action, commanding ships and airplanes, but in a more arcade like fashion. It is complete, mindless fun, and if you have an interest in battles like Midway, it's a really badass game.
Those are all the WW2 Videogames I recall playing, enjoy.
And yes, I do have to out do everyone's posts.
