Answer:
There were an estimated 10,000 Allied casualties on D-Day, which comprises dead, wounded, and missing. There are no official figures for D-Day casualties, only estimates.
In the Allied landings at Normandy, one estimate of US losses was 2500 killed and another 4100 wounded. British casualties totalled about 2700 and Canadian 1000 (300 dead).
Casualties among German defenders numbered between 4000 and 9000, which could include those lost defending the beaches as well as subsequent fighting during their retreat.