Grimalkin may refer to:
grimalkin is an old or evil-looking female cat. The term stems from "grey" (the color) plus "malkin", an archaic term with several meanings (a cat, a low class woman, a weakling, a mop) derived from a hypocoristic form of the female name Maud. Scottish legend refers to the grimalkin as a faery cat that dwells in the highlands.A
Grimalkin was also the name of the witches' cat familiar in Macbeth by William Shakespeare. The term may derive from Beware the Cat (published 1570) by William Baldwin.