Breakdown may refer to:

• Electrical breakdown
• Chemical breakdown
• Biological decomposition
• Nervous breakdown
• Societal breakdown
• A breakdown is a statement explaining the details of something such as a bill or cost of a plan
• A script breakdown for a play, film, or comic book
• Breakdown (album), by Melissa Etheridge.
• Breakdown (comics), published by Devil's Due Productions as part of their Aftermath line.
• Breakdown (music), a type of musical piece (e.g. "Foggy Mountain Breakdown").
• Breakdown (film), starring Kurt Russell.
• Breakdown (song), by Mariah Carey
• Breakdown (song), by Jack Johnson
• Breakdown van (or tow truck)
• Breakdown (-core), a 4/4 interlude in a hardcore punk or metalcore musical track.
• A former persona of professional wrestler Lance Hoyt.
• A Pay-Per-View event held by The World Wrestling Federation
• Breakdown (computer game)
• How America's Intelligence Failures Led to September 11, a book by Bill Gertz