- HD 1080
- Runtime: 92m.
- Status: Released
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- Languages: en
- Country: United Kingdom, United States of America
- Director: William Castle
- Stars: Nigel Green, Mary Badham, Pat Cardi, Robert Pickering, Linda Lawson
- keywords: uncle
- Production_studio: William Castle Productions
- Slogan: LOVABLE OR LETHAL? Are they bad seeds...or frightened innocents caught in a diabolical duel with death!
- The Let's Kill Uncle is featured in the top rankings of 1966
- #25 in Top Thriller Movies of 1966
- #25 in Top Horror Movies of 1966
A 12-year-old orphan who has just inherited a fortune is trapped on an island with his uncle, a former British intelligence commander who intends to kill him. A young girl is the boy's only ally against the sarcastic uncle, who uses hypnotism, a pool of sharks, fire, and poisonous mushrooms as weapons.