There are quite a few deaths in the book, and it mentions quite a lot of people who died before the settings of the books (Harry's parents, Moaning Myrtle etc), as for deaths that occur in the books, as memory best serves they are as follows:
Book 1: Quirrell, Nicholas and Perenelle Flamel (not directly in the book, but after the elixir they have stored to set their affairs in order runs out)
Book 2: The Basilisk
Book 3: None, I think.
Book 4: Bertha Jorkins, Frank Bryce, Barty Crouch Snr, Barty Crouch Jr, Cedric Diggory
Book 5: Broderick Bode, Sirius Black
Book 6: (sometime in the summer holidays, Igor Karkaroff) Amelia Bones, Emmeline Vance, Hannah Abbott's mother, Aragog, Gibbon, Albus Dumbledore
Book 7: Charity Burbage, Hedwig, Mad Eye Moody, Rufus Scrimgeour, Ted Tonks, Dirk Cresswell, Gregorovitch, Bathilda Bagshot, Gellert Grindlewald, Wormtail, Dobby, Vincent Crabbe, Nymphadora Tonks, Remus Lupin, Fred Weasley, Colin Creevey, Severus Snape, Harry (though temporarily), Bellatrix Lestrange, Voldemort
50 are killed at the battle of Hogwarts, there are also a lot of unnamed Muggles killed, Gornuk and at least one other goblin (at Malfoy Manor when reporting the Gringotts break in) and possibly at least one unnamed death eater (by Kingsley in the chase at the beginning of Deathly Hallows)