Marie Louise Killick (in some sources Maria) (1914 Mitcham, Surrey - (1964 Guildford, Surrey, England) was an English audio engineer who patented the truncated-tip sapphire stylus in 1945 for playing gramophone records.
Following the re-instatement of her patent, she was involved from 1953 in a lawsuit against Pye Ltd. (Killick v Pye Ltd) for their infringement of her patent. Killick won the suit in The High Court of Justice 1957. Pye Radio appealed but the judgement of the lower court, that they had infringed, was upheld in 1958.  but her bankruptcy in the following year prevented her from profiting from the outcome.
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- Meridian Focus Documentary (1996). "A Gem of an Idea". British Film Institute.
- "WOMAN INVENTOR WINS; Briton May Get 14 Million for Her Phonograph Stylus". New York Times. 1958-07-23. p. 3.
- "Golden Dream Comes To End In Bankruptcy". Chicago Daily Tribune. 1959-09-26. pp. W_A15.
- Barrie Blake-Coleman (Winter 1995). "A Gem of an Idea: Mrs Killick and the Sapphire Stylus". Inventors World Quarterly #4.
- Barrie Blake-Coleman and Cynthia Killick (1996). "A Gem of an Idea: Mrs. Killick and the Sapphire - Postscript". Inventors World Quarterly.
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