Eleanor Audley

Eleanor Audley (November 19, 1905 – November 25, 1991) was an American actress who was a familiar radio and animation voice, in addition to her TV and film roles. She is best remembered on television as Eunice Douglas on Green Acres and, for many, for providing Disney animated features with their most outstanding and memorable villainess voices, most notably two of the most sinister Disney villainesses, Lady Tremaine and Maleficent. Description above from the Wikipedia article Bernard Lee, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Cast

Sleeping Beauty
Maleficent (voice)

Cinderella
Lady Tremaine (voice)

Cell 2455 Death Row
Blanche

Gambling House
Mrs. Livingston

The Unguarded Moment
Pendleton's Secretary

The Pleasure of His Company
Mrs. Thompson (uncredited)

The Second Time Around
Mrs. Trask

Pretty Baby
Miss Brendel

The FBI Story
Mrs. King - Graham's Mother (uncredited)

Kisses for My President
School Principal Osgood (uncredited)

Home Before Dark
Mrs. Hathaway

The Wheeler Dealers
Art Critic (uncredited)

Step Down to Terror
Miss Brighton (uncredited)

A Man Called Peter
Member of Atlanta Church Congregation

Spoilers of the Forest
Mrs. Walters

No Way Out
Wife (uncredited)

A Summer Place
Waiting Guest at Molly's College (uncredited)

Prince of Players
Mrs. Montchesington

Hook, Line and Sinker
Mrs. Durham

I'll Take Sweden
Mrs. Dow

Three Secrets
Warden (uncredited)

The Unsinkable Molly Brown
Mrs. Cartwright (uncredited)

All That Heaven Allows
Mrs. Humphrey (uncredited)

Disney's Greatest Villains
Lady Tremaine / Maleficent (voice) (archive footage)