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William Howard Livens (28 March 1889 – 1 February 1964) was an engineer, a soldier in the British Army and an inventor particularly known for the design of chemical warfare and flame warfare weapons. Resourceful and clever, Livens’ successful creations were characterised by being very practical and easy to produce in large numbers. In an obituary, Sir Harold Hartley said "Livens combined great energy and enterprise with a flair for seeing simple solutions and inventive genius."

Livens is best known for inventing the Livens Projector, a simple mortar-like weapon that could throw large drums filled with inflammable or toxic chemicals. In World War I, the Livens Projector became the standard means of delivering gas attacks and it remained in the arsenal of the British army until the early years of the Second World War.

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