Black Knife, Blackknife, or black knife may refer to:
Black Knife, Spanish name Dangerous Negro, Baishan (c. 1816 – 1857), a Chihenne (Mimbres) Apache chieftain involved in the Apache Wars. Sgian-dubh ("black knife" or "hidden knife"), singled-edged knife, part of traditional Scottish Highland dress Blackknife, a model of Modulus Guitars Black Knife, a song from the Deltarune Soundtrack which plays in Deltarune Chapter 3
See also Caine Black Knife Athame