[Dr.Kelvinstein]

Here's a list of every Italian zombie movie up till 2000, as compiled by Peter Dendle in The Zombie Movie Encyclopedia. It's damn exhaustive.

After Death
Baron Blood
The Beyond
Burial Ground
The Cemetery Man
City Of The Walking Dead
Dawn Of The Mummy
Demoni 3
Dr Butcher MD
Erotic Nights Of The Living Dead
The Gates Of Hell
The House By The Cemetery
Let Sleeping Corpses Lie
Night of The Zombies
Raptors
Return Of The Zombies
Terror Creatures From The Grave
Vengeance Of The Zombies
War Of The Zombies
Zeder
Zombi
Zombie 6: Monster Hunter (really just a sequel to Grim Reaper AKA Anthropophagus, but released on video in America as a zombie film)
Zombi 3

And I guess Dawn Of The Dead could count even though he doesn't mention it. Most of its money was Italian, and film critics consider Once Upon a Time in the West an American Western because it was made with American money, so I guess the reverse would work, too. I've seen everything mentioned except the sword-and-sandal movie War Of The Zombies. Anyone seen it???