Ernest Thesiger, CBE, was an English stage and film actor. He is best known for his performance as Dr. Septimus Pretorius in James Whale's 1935 film Bride of Frankenstein.
| Movie | Famous Monster: Forrest J Ackerman | Self (archive footage) | 2007-05-16 |
| Movie | Universal Horror | (archive footage) | 1998-10-08 |
| Movie | Terror in the Aisles | Dr. Pretorius (archive footage) (uncredited) | 1984-10-26 |
| Movie | The Roman Spring of Mrs. Stone | Stefano | 1961-12-28 |
| Movie | The Battle of the Sexes | Old Macpherson | 1960-02-25 |
| Movie | Sons and Lovers | Mr. Hadlock | 1960-08-29 |
| Movie | The Horse's Mouth | Hickson | 1958-11-11 |
| Movie | Doctor at Large | Examiner | 1957-03-26 |
| Movie | The Truth About Women | Judge | 1957-10-01 |
| Movie | Who Done It? | Sir Walter | 1956-03-20 |
| Movie | Three Men in a Boat | 3rd Old Gentleman | 1956-12-23 |
| Movie | Quentin Durward | Lord Crawford | 1955-09-09 |
| Movie | Value for Money | Lord Dewsbury | 1955-08-09 |
| Movie | An Alligator Named Daisy | Notcher (uncredited) | 1955-12-13 |
| Movie | Father Brown | The Vicomte | 1954-06-08 |
| Movie | The Million Pound Note | Mr. Garrett, Bank Director | 1954-01-07 |
| Movie | Make Me an Offer! | Sir John Nightingale | 1954-12-08 |
| Movie | The Robe | Emperor Tiberius | 1953-09-16 |
| Movie | Meet Mr. Lucifer | Mr. Macdonald | 1953-11-30 |
| Movie | The Magic Box | Earl | 1952-01-01 |
| Movie | The Woman's Angle | Judge | 1952-02-12 |
| Movie | Scrooge | The Undertaker | 1951-11-30 |
| Movie | Laughter in Paradise | Endicott | 1951-06-01 |
| Movie | The Man in the White Suit | Sir John Kierlaw | 1951-08-07 |
| Movie | Last Holiday | Sir Trevor Lampington | 1950-05-15 |
| Movie | The Bad Lord Byron | Count Guiccioli | 1949-04-18 |
| Movie | The Winslow Boy | Mr. Ridgeley Pierce | 1948-09-24 |
| Movie | Quartet | Henry Dashwood (segment "The Colonel's Lady") | 1948-10-26 |
| Movie | Brass Monkey | Ryder-Harris | 1948-12-01 |
| Movie | The Man Within | Farne | 1947-05-19 |
| Movie | Jassy | Sir Edward Follesmark | 1947-08-13 |
| Movie | The Ghosts of Berkeley Square | Dr Cruickshank | 1947-10-30 |
| Movie | Beware of Pity | Baron Emil de Kekesfalva | 1946-07-22 |
| Movie | A Place of One's Own | Dr. Richard Marsham | 1945-03-20 |
| Movie | Caesar and Cleopatra | Theodotus | 1945-12-11 |
| Movie | Don't Take It to Heart | Justices' Clerk | 1944-11-13 |
| Movie | Henry V | Duke of Berri - French Ambassador | 1944-11-24 |
| Movie | My Learned Friend | Ferris | 1943-10-25 |
| Movie | The Lamp Still Burns | Chairman | 1943-11-29 |
| Movie | They Drive by Night | Walter Hoover | 1938-12-01 |
| Movie | The Ware Case | Carter | 1938-12-02 |
| Movie | The Man Who Could Work Miracles | Maydig | 1936-07-23 |
| Movie | Bride of Frankenstein | Doctor Pretorius | 1935-04-20 |
| Movie | My Heart Is Calling | Fevrier | 1935-01-01 |
| Movie | The Night of the Party | Adrian Chiddiatt | 1934-07-16 |
| Movie | The Only Girl | The Chamberlain | 1933-06-17 |
| Movie | The Ghoul | Laing | 1933-08-01 |
| Movie | The Old Dark House | Horace Femm | 1932-10-20 |
| Movie | The Vagabond Queen | Lidoff | 1929-05-11 |
| Movie | Week-End Wives | Bertram | 1929-05-14 |
| Movie | The Bachelor's Club | Israfel Mondego | 1921-06-01 |
| Movie | The Adventures of Mr. Pickwick | Mr. Jingle | 1921-11-01 |
| Movie | A Little Bit of Fluff | Bertram Tully | 1919-05-01 |
| Movie | The Life Story of David Lloyd George | Joseph Chamberlain | 1918-01-01 |
| Movie | Nelson | Wiliam Pitt | 1918-01-02 |