- Named after Pope Leo XIII, who was Pope at the time of his birth.
- Worked as a wine trade clerk as a teenager.
- Served in the British Army in World War I.
- Made his film debut in 1934 in Sadie McKee.
- Appeared in six Alfred Hitchcock films: Rebecca, Suspicion, Spellbound, The Paradine Case, Strangers on a Train and North by Northwest.
- Starred in the TV series Topper, The Man From U.N.C.L.E. and The Girl From U.N.C.L.E.
- Died in 1972 of pneumonia brought on by cancer.
- Mentioned in the song "Science Fiction/Double Feature" from The Rocky Horror Picture Show.
- 1967, Emmy — Outstanding Performance by an Actor in a Supporting Role in a Drama: Nominee
- 1966, Emmy — Outstanding Performance by an Actor in a Supporting Role in a Drama: Nominee
- Catherine Carroll — Mother
- William Carroll — Father
- Birth Name: Leo Gratten Carroll
- Birth Place: Weedon, England
- Died: October 16, 1972
- Profession: Actor
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