"K-K-K-Katy" is a World War I-era song written by Canadian-American composer Geoffrey O'Hara in 1917 and published in 1918.

[3] A version titled "K-K-K-Klanswoman," with altered lyrics, was published in a "Song Book For Women of the Ku Klux Klan," c.1924.

[citation needed] Bing Crosby included the song in a medley on his album Join Bing and Sing Along (1959) The song was the basis of a parody which ridiculed the Ku Klux Klan,[7] a white supremacist organization in the United States often referred to by its acronym, KKK.

Additionally, the political-humor group Capitol Steps performed a parody of this song entitled "K-K-Kuwaitis", about the 1990 invasion of Kuwait which began the Gulf War.

Bach's Missa Hilarious includes a section with the text "K-K-K-Kyrie eleison", in reference to this song.