From Wikipedia
George Zucco (11 January 1886 – 27 May 1960) was an English character actor who appeared, almost always in supporting roles, in 96 films during a career spanning two decades, from 1931 to 1951. In his horror films, he often played a suave villain or a mad doctor.
House of Frankenstein
Prof. Bruno Lampini
Lured
H.R. Barrett
Midnight Manhunt
Jelke
The Mummy's Hand
Professor Andoheb
Scared to Death
Dr. Josef Van Ee
The Hunchback of Notre Dame
Procurator
The Roof
James Renton
Charlie Chan in Honolulu
Dr. Cardigan
A Woman's Face
Defense Attorney
Voodoo Man
Nicholas
Dead Men Walk
Lloyd Clayton / Elwyn Clayton
Fog Island
Leo Grainger
The Mummy's Tomb
Andoheb
The Mummy's Ghost
Andoheb, High Priest of Arkan
Who Killed Doc Robbin?
Doc Robbin
Return of the Ape Man
Ape Man
The Flying Serpent
Prof. Andrew Forbes
The Black Swan
Lord Denby
The Barkleys of Broadway
Judge
After the Thin Man
Dr. Adolph Kammer
Rosalie
General Maroff
Arrest Bulldog Drummond
Rolf Alferson
New Moon
Vicomte Ribaud
Sherlock Holmes in Washington
Heinrich Hinckel aka Richard Stanley
Moss Rose
Craxton
Madame Bovary
Dubocage
Saratoga
Dr. Bierd
The Adventures of Sherlock Holmes
Professor Moriarty
Where There's Life
Paul Stertorius
Dr. Renault's Secret
Dr. Robert Renault
Ellery Queen and the Murder Ring
Dr. Edwin L. Jannery
Tarzan and the Mermaids
Palanth, the High Priest
The Mad Ghoul
Dr. Alfred Morris
Shadows in the Night
Frank Swift
The Seventh Cross
Fahrenburg
Week-End at the Waldorf
Bey of Aribajan
The Black Raven
Amos Bradford
My Favorite Blonde
Dr. Hugo Streger
The Monster and the Girl
Dr. Parry
The Mad Monster
Lorenzo Cameron
Arsène Lupin Returns
Prefect of Police
Captain Fury
Arnold Trist
Dracula: A Cinematic Scrapbook
Dr. Joseph Van Ee (archive footage)
Half Way to Shanghai
Peter van Hoost
Sudan
Horadef
Holy Matrimony
Mr. Crepitude
Having Wonderful Crime
King aka The Great Movel
Harbor of Missing Men
H.G. Danziger
Dark Streets of Cairo
Abbadi
Secret Service Investigator
Otto Dagoff
The Magnificent Fraud
Dr. Luis Virgo
The Imperfect Lady
Mr. Mallam
Desire Me
Father Donnard
London by Night
Inspector Jefferson
Terror in the Pharaoh's Tomb
Dr. Moriarty (archive footage)
Parnell
Sir Charles Arthur Russell
Fast Company
Otto Brockler
Arise, My Love
Prison Governor
Let's Dance
Judge Mackenzie
Topper Returns
Dr. Jeris
Here I Am a Stranger
James K. Spaulding
Souls at Sea
Woodley
Suez
Prime Minister
Autumn Crocus
Revered Mayne
The First Legion
Father Robert Stuart
Vacation from Love
Dr. Waxton
The Horror of It All
Dr. Cameron (archive footage)
Hold That Blonde!
Dr. Pavel Storasky
Madame X
Dr. LaFarge
Captain from Castile
Marquis De Carvajal
Abdul the Damned
Officer of the Firing Squad
The Cat and the Canary
Lawyer Crosby
The Man from Toronto
Squire
The Lady Is Willing
Bailiff
The Midshipmaid
Lord Dore
The Good Companions
Fauntley
The Man Who Could Work Miracles
The Colonel's Butler
The Pirate
The Viceroy
Flame Of Stamboul
The Voice
Never a Dull Moment
Tony Rocco
International Lady
Webster
Confidential Agent
Detective Geddes
David and Bathsheba
Egyptian Ambassador (uncredited)
It's a Bet
Convict
Sinner Take All
Crowley Bascomb
What Happened Then?
Inspector Hull
Dreyfus
Jacques Marie Eugène Godefroy Cavaignac
The Bride Wore Red
Count Armalia
Watchtower Over Tomorrow
Security Council Chair
The Firefly
Secret Service Chief
Something Always Happens
Proprietor of the Maison de Paris
Lord Jeff
James 'Jim' Hampstead
Doom of Dracula
Prof. Lampini (archive footage)
The Secret Garden
Dr. Fortescue
Marie Antoinette
Governor of Conciergerie (uncredited)
Joan of Arc
Constable of Clervaux
There Goes the Bride
Prosecutor (uncredited)