Look up Katzenjammer or katzenjammer in Wiktionary, the free dictionary.

Katzenjammer (German pronunciation: [ˈkaʦənˌjamɐ]) is a German word literally meaning "cat's wail" (caterwaul) and hence "discordant sound", sometimes used to indicate a general state of depression or bewilderment. In the English speaking world it is often used as a term for a hangover, with the sufferer's groans of discomfort being likened to a wailing cat. In fact, the German language uses the term "Kater" (tomcat) for this situation.

Katzenjammer may refer to:

• Katzenjammer (band), a Norwegian pop/folk band
• Katzenjammer Kabarett, a French rock band
• The Katzenjammer Kids, an American comic strip
• Fran Katzenjammer, a fictional character in the British sitcom Black Books
• "Katzenjammer", a song by Big Talk
• "Katzenjammer", a song by Kyuss on the album Wretch
• Katzenjammer Cave, in the Makapansgat paleontological site
• Worbey & Farrell, previously known as Katzenjammer, a British piano musical comedy duo
• The Katzenjammer Kids a short-lived band founded by Randy Rhoads
• Fred Katz and his Jammers, a 1959 jazz cello album
• “The Katzenjammers” a Trinidad Steelband led by Percy Thomas, winners of the Trinidad Steelband Festival competition (year unknown), recorded by Cook Laboratories and published circa 1957.
• "Katzenjammer," a 2009 album by Car Seat Headrest's Will Toledo as Nervous Young Men