Jessie Royce Landis

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.
Cast

North by Northwest
Clara Thornhill

To Catch a Thief
Jessie Stevens

Airport
Harriet DuBarry Mossman

Main Street to Broadway
Self (uncredited)

Boys' Night Out
Ethel Williams

The Swan
Princess Beatrix

My Man Godfrey
Angelica Bullock

Goodbye Again
Mrs. Van der Besh

Mr. Belvedere Goes to College
Mrs. Chase

Critic's Choice
Charlotte Orr aka Charlie

Bon Voyage!
Countessa 'La Comtesse' DuFresne

I Married a Woman
Mrs. Blake

Mr. and Mrs. Bo Jo Jones
Grandmother Greher

The Girl He Left Behind
Mrs. Madeline Shaeffer

Mother Didn't Tell Me
Mrs. Wright

A Private's Affair
Elizabeth T. Chapman

Derelict
Helen Lorber

My Foolish Heart
Martha Winters

It Happens Every Spring
Mrs. Greenleaf

Gidget Goes to Rome
Albertina Blythe

Grace Kelly: The American Princess
Self (archive footage)

The Ceremony of Innocence
Queen Mother Alfreda

Meet Me Tonight
Olive Lloyd Ransome (segment "Ways and Means")