Margaret Rutherford

Dame Margaret Taylor Rutherford DBE (11 May 1892 – 22 May 1972) was an English character actress, who first came to prominence following World War II in the film adaptations of Noel Coward's Blithe Spirit, and Oscar Wilde's The Importance of Being Earnest. She is best-known for her 1960s performances as Miss Marple in several films based loosely on Agatha Christie's novels. Description above from the Wikipedia article Margaret Rutherford, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Cast

Chimes at Midnight
Mistress Quickly

Murder She Said
Miss Jane Marple

Murder at the Gallop
Miss Jane Marple

Murder Most Foul
Miss Jane Marple

Murder Ahoy
Miss Jane Marple

A Countess from Hong Kong
Miss Gaulswallow

Passport to Pimlico
Professor Hatton-Jones

The Importance of Being Earnest
Miss Prism

The Alphabet Murders
Miss Jane Marple (uncredited)

I'm All Right Jack
Aunt Dolly

The Smallest Show on Earth
Mrs. Fazackalee

The V.I.P.s
The Duchess of Brighton

Just My Luck
Mrs. Dooley

Trouble in Store
Miss Bacon

Yellow Canary
Mrs. Towcester

The Mouse on the Moon
Grand Duchess Gloriana XIII

Blithe Spirit
Madame Arcati

The Magic Box
Lady Pond

The Runaway Bus
Miss Cynthia Beeston

The Happiest Days of Your Life
Muriel Whitchurch

On the Double
Lady Vivian

Miranda
Nurse Carey

Mad About Men
Nurse Carey

Truly Miss Marple: The Curious Case of Margaret Rutherford
Self (archive footage)

English Without Tears
Lady Christabel Beauclerk

Innocents in Paris
Gwladys Inglott

Dusty Ermine
Evelyn Summers aka Miss Butterby

The Wacky World of Mother Goose
Mother Goose (voice)

Miss Robin Hood
Heather Honey

Quiet Wedding
Second Magistrate

An Alligator Named Daisy
Prudence Croquet

The Demi-Paradise
Rowena Ventnor

Castle in the Air
Miss Nicholson

Arabella
Princess Ilaria

Big Fella
Nanny (uncredited)

Curtain Up
Catherine Beckwith / Jeremy St. Claire

Aunt Clara
Clara Hilton

Her Favourite Husband
Mrs. Dotherington

Spring Meeting
Aunt Bijou

Beauty and the Barge
Mrs. Baldwin

Meet Me at Dawn
Madame Vernorel

Talk of the Devil
Unknown
The Stately Ghosts of England
Herself
Catch as Catch Can
'Crafty' Maggie Carberry

While the Sun Shines
Dr. Winifred Frye

To See Such Fun
Unknown

The Virgin and the Gypsy
Grandma (scenes deleted)