Knockdown or knock-down may refer to:
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Knockdown, a situation in full-contact combat sports where a fighter is down or vulnerable, often preliminary to a knockout
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Knockdown, a nautical term for a near-capsize
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Knockdown (arcade game)', an arcade game released by Namco
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"Knockdown" (Castle), the thirteenth episode of the third season of the TV series Castle
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Knockdown (G.I. Joe), a fictional character in the G.I. Joe universe
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"Knockdown" (song), a song by Alesha Dixon
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Knockdown, Gloucestershire, a hamlet near Sherston, Wiltshire, United Kingdom
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Gene knockdown, a genetic modification technique
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knock-down fastener
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knock-down furniture
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Knock-down kit, a complete kit needed to assemble a vehicle
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Knockdown resistance, genetic resistance to pyrethroid insecticides in many insect species
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Knockdown texture, a drywall finishing style
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KnocDown, a music producer
