The cat o' nine tails is a type of multi-tailed whip.

Cat o' nine tails may also refer to:

Literature Cat O'Nine Tails (novel), a 2007 novel by Julia Golding Cat O'Nine Tails, a 1972 novel by Paul Gillette Cat O'Nine Tails (play), a 1927 three-act mystery play by Lawrence Worcester

Other uses Typha latifolia, a perennial herbaceous plant commonly named "cat-o'-nine-tails" The Cat o' Nine Tails, a 1971 Italian film Cat O' 9 Tails, an enemy in the 1995 video game Donkey Kong Country 2 "Cat O' Nine Tails", a song by John Zorn from the 1999 album The String Quartets

See also Cat O'Nine Tales, a 2006 short story collection by Jeffrey Archer Cat of Many Tails, a 1949 novel by Ellery Queen