Here are some casualties counts I found about some operations of WWII (I left a winter war entry).

Please be advised that I'm not sure if they are reliable, although the few I could cross checked with my own references seem correct (even if there are no precise info about the timespan).

I will add new data overtime, feel free to correct some figures may be wrong or "polemical estimations" and provide additions (for example initial Japanese advances in the PTO etc...)

1,800,000 - Battle of Stalingrad (1942–1943)
1,500,000 - Siege of Leningrad (1941–1944)
700,000 - Battle of Moscow (1941–1942)
500,000 - Battle of Smolensk (1941)
400,000 - Battle of Kiev (1941)
370,000 - Battle of Voronezh (1942)
370,000 - Battle of Belarus (1941)
280,000 - Warsaw Uprising (1944)
270,000 - Second Rzhev-Sychevka Offensive (1942)
270,000 - Battle of West Ukraine (1944)
260,000 - Battle of the Caucasus (1942)
230,000 - Battle of Berlin (1945)
230,000–350,000 - Battle of Kursk (1943)
190,000 - Battle of West Ukraine (1941)
180,000 - Battle of France (1940)
175,000–350,000 - Operation Bagration (1944)
170,000 - Battle of the Lower Dnieper (1943)
170,000 - Battle of Königsberg (1945)
150,000 - Battle of Rostov (1941)
150,000 - Battle of Okinawa (1945)
132,000 - Battle of Normandy (1944)
130,000 - Battle of Budapest (1945)
117,000 - Battle for the Liberation of Manila (1945)
100,000 - Battle of Chernikov-Poltava (1943)
100,000 - Battle of Smolensk (1943)
83,000 - Battle of the Baltic (1941)
80,000 - Battle of Gazala (1942)
74,000 - Battle of Polyarnoe-Karelia (1941)
72,000+ - Battle of Belgorod (1943)
70,000 - Second Battle of El Alamein (1942)
70,000 - Second Battle of the Atlantic (1939–1945)
69,000 - Battle of Leyte (1944)
66,000 - Battle of Donbass (1943)
65,000 - Battle of Lvov-Sandomir (1944)
61,000 - Battle of the Baltic (1944)
60,000 - Battle of Monte Cassino (1944)
55,000 - Korsun Pocket (1944)
55,000 - Battle of Voronezh (1942)
45,000 - Fourth Battle of Kharkov (1943)
45,000 - Battle of Hurtgen Forest (1944–1945)
44,000 - Battle of the Crimea (1944)
42,000 - Battle of the Seelow Heights (1945)
40,000 - Battle of Imphal (1944)
38,000 - Battle of the Bulge (1944–1945)
30,000 - Battle of Saipan (1944)
29,000 - Battle of Iwo Jima (1945)
26,000 - Battle of Guadalcanal, (1942–1943)
26,000 - Katyn Massacre (1940)
21,000 - Battle of Guam (1944)
18,500 - Operation Market Garden (1944)
17,000 - Battle of Bataan (1942)
13,500 - Battle of Leyte Gulf (1944)
12,000 - Siege of Tobruk (1941)
7,200 - Kokoda Track Campaign, (1942–1943)
6,500 - Battle of the Kasserine Pass (1943)
6,500 - Battle of Tinian (1944)
5,600–6,600 Battle of Tali-Ihantala (1944)
5,700 - Battle of Tarawa (1943)
5,350+ - Battle of Suomussalmi (1939–1940)
2,800 - Battle of Midway (1942)

Those are some interesting numbers. It makes the allies look like small potatoes compared to the Russian front. Some like the Battle of Suomussalmi and a few others I never even heard of.

I am sure China suffered heavy losses too but they did not keep records.

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Do these include civilian deaths as well in Stalingrad and Berlin for instance?

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@TA152 : I think it's a Winter war campaign

@ Miller : I don't know, but I think Berlin and Leningrad statistics include civilian casualties. It's taken from wikipedia and some stats might be debatable.

Pretty sad numbers, anyway.

I have noticed that some battles posted seem a little light. Battle of Kusk for example had around 1.1 million total. The batte of Dnieper had casualties ranging from 1.7 million to 2.7 million. Battle of Moscow had at least 1 million.... Also I dont see any of the first 3 battles of Karkov which consisted of more then 300,000

By the way, all of these are Wiki sources and I know how we all like those

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler

Yes, I already said above, this comes from wikipedia.

What I'd like is to be provided alternate numbers in order to correct the list, like a ww2f.com collective work, maybe you could provide number for the first 3 battles of Karkov ?

I found out the Korsun stat does not match Glantz's book

I have seen it stated over the years that the USA never actually revealed its real losses in WWII or since. I also suspect Russia enjoyed increasing its losses after the war to make its heroic sacrifice appear bigger and to cover all the Russian soldiers it later sent to its Gulag, like Solzhenitsyn. Most of the German loses in the East were due to Hitler's idiot orders to hold dirt until pockets were formed, and then to keep holding the pockets without supply lines. Siegfried Knappe in his book Soldat states that after he witnessed Stalingrad from the safety of the Rostov HQ, he knew the war effort was doomed - though he did not as yet know to what degree. Had Hitler choked on a pretzel in even late 42 I don't think German losses in the East would have been that bad.