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A knife is a sharpened hand tool.
Knife may also refer to:
- The Knife, a Swedish electronic music duo
- "Knife" Sotelo (born 1987), an American rapper and author
- Knife (album), by Aztec Camera
- The Knife (Goldfinger album)
- The Knife (The Knife album)
- "Knife" (Grizzly Bear song)
- "The Knife" (song), by Genesis
- "Knife", a song by Rockwell from Somebody's Watching Me"
- "Knives", a song by 10 Years from Minus the Machine