Grimalkin (disambiguation)
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A grimalkin (or greymalkin) is an old or evil-looking female cat.
Grimalkin may also refer to:
- The Grimalkin, the 2006 album by Noekk
 - SV Grimalkin, a yacht that competed but failed to finish in the 1979 Fastnet race
 - Grimalkin, a witch assassin in the Spook's series by Joseph Delaney
 - "Grimalkin", a poem by Thomas Lynch
 - Grimalkin, the 1811 winner of the Doncaster Cup horse race
 - Grimalkin, a comic strip by Louis Wain
 - Grimalkin, a cat in the book "King of the Wind" by Marguerite Henry (1948)
 - The Grimalkin is a malk in The Dresden Files; a species of feline fae allied with the Winter court, about the size of a bobcat, but stronger, faster and smarter than most humans.
 
Graymalkin may refer to:
- the familiar, presumably a cat, of one of the three witches in Shakespeare's Macbeth
 - Graymalkin, a fictional character in the X-Men series of comics
 - Graymalkin Industries, a front for X-Men activities in comics
 - Graymalkin, a space station dismantled and used as material for the island of Providence in Marvel comics
 - Graymalkin, a demonic cat in the 1957 British film Curse of the Demon