With sometimes more of a focus on the character rather than an actress's list of femme fatale credits, I submit the following ten for consideration:

Peggy, BAIT (Cleo Moore)
Carola Ballister, DANGEROUS PARTNERS (Signe Hasso)
Estelle Mitchell, THE GUILTY (Bonita Granville)
Virginia Wilson/Yolanda Lang, SCREAMING MIM (Anita Ekberg)
Lorna Vecchi, BAD BLONDE (Barbara Payton)
Barbara Mathews, DRIVE A CROOKED ROAD (Dianne Foster)
Lois Frazer, THE MAN WHO CHEATED HIMSELF (Jane Wyatt)
Lona McLane, PUSHOVER (Kim Novak)
Kitty Collins, THE KILLERS (Ava Gardner)
Flaxy Martin, FLAXY MARTIN (Virginia Mayo)