- Great nephew of Anna Leonowens, the real-life historical figure upon whom the musical The King and I is based.
- Got the part of Frankenstein, for which he is most famous, after Bela Lugosi (Karloff's main professional rival) turned it down; Karloff was 44 when he appeared in the film.
- Impersonated by Gary Pickett in the song "Monster Mash"; Karloff was flattered by the tune and later performed it himself.
- He loved children and was actively involved in charities benefiting children; despite his monster persona, children loved him as well.
- His daughter, Sara Karloff Cotten, frequently appears at science fiction conventions to represent her father's work.
- 1956, Tony — Actor (Dramatic): Nominee
- 1967, Grammy — Best Recording for Children: Winner
- Sara Karloff Cotten — Daughter
- Charles Pratt — Brother
- George Pratt — Brother
- Eliza Sarah Millard Pratt — Mother
- Montana Williams — Ex-wife
- Olive de Wilton — Ex-wife
- Grace Harding — Ex-wife
- Edward Pratt — Brother
- Emma Pratt — Half Sister
- Evelyn Helmore — Wife
- Anna Leonowens — Great-aunt
- Julia Donkin — Sister
- John Pratt — Brother
- Frederick Pratt — Brother
- Dorothy Stine — Ex-wife
- Eliza Julia Edwards Pratt — Grandmother
- David Pratt — Brother
- Helen Vivian Soule — Ex-wife
- Edward John Pratt Jr. — Father
- Richard Pratt — Brother
- University of London, King's College, London, England
- Birth Name: William Henry Pratt
- Birth Place: East Dulwich, London, England
- Died: February 2, 1969
- Profession: Actor, Voice overs
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