Jessie Royce Landis
Acting
Jessie Royce Landis (born Jessie Medbury; November 25, 1896 – February 2, 1972) was an American actress. Her name is also seen as Jesse Royce-Landis. She remains perhaps best-known for her mother roles in the Hitchcock films To Catch a Thief (1955) and North by Northwest (1959). Description above from the Wikipedia article Jessie Royce Landis, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Grace Kelly: The American Princess
Self (archive footage)
Mr. and Mrs. Bo Jo Jones
Grandmother Greher
The Ceremony of Innocence
Queen Mother Alfreda
Airport
Harriet DuBarry Mossman
Gidget Goes to Rome
Albertina Blythe
Critic's Choice
Charlotte Orr aka Charlie
Boys' Night Out
Ethel Williams
Bon Voyage!
Countessa 'La Comtesse' DuFresne
Goodbye Again
Mrs. Van der Besh
A Private's Affair
Elizabeth T. Chapman
North by Northwest
Clara Thornhill
I Married a Woman
Mrs. Blake
My Man Godfrey
Angelica Bullock
The Girl He Left Behind
Mrs. Madeline Shaeffer
The Swan
Princess Beatrix
To Catch a Thief
Jessie Stevens
Main Street to Broadway
Self (uncredited)
Meet Me Tonight
Olive Lloyd Ransome (segment "Ways and Means")
Mother Didn't Tell Me
Mrs. Wright
My Foolish Heart
Martha Winters
It Happens Every Spring
Mrs. Greenleaf
Mr. Belvedere Goes to College
Mrs. Chase
Derelict
Helen Lorber