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