"It Ain't My Fault" is a song by American country music duo Brothers Osborne. The song was released in January 2017 as the duo's fifth single overall. Duo members John and T.J. Osborne co-wrote the song with Lee Thomas Miller.

The duo wrote the song with Lee Thomas Miller in mid-2015. The song is about "a guy who doggedly, humorously refuses to own up to his own actions", as reflected in the title line. Miller came up with the opening lines about "a chain of events leading to an affair" while using a phone app that simulates drum patterns to create a drum pattern similar to the one used in "(I Can't Get No) Satisfaction". Billboard compared the "series of occurrences that create a cheatin’ scenario" to "Third Rock from the Sun" by Joe Diffie. The recording session featured Jay Joyce as producer, Jason Hall as engineer, along with John Osborne on lead guitar, Adam Box on drums, and Pete Sternberg on bass.

John Osborne told Billboard that "We’ve all been there where we’re drunk and stubborn, and we’re not willing to admit it. That’s really what the song’s about. Even the singer knows that it’s his fault." Lead singer T. J. Osborne sings the song in a primarily "darker frequency".

Billy Dukes of Taste of Country describes the song as a "guitar-drenched, unapologetic jam that’s not likely to please the pop-country crowd". while Jason Scott of AXS said that the duo "hit on all cylinders with their new single". Angela Stefano of The Boot states that the tune "features a steady drum beat and guitar flourishes throughout its verses, which find the Osbornes placing blame for the previous night’s series of events on everyone (and everything) but themselves".

The song was the most-added single at Country radio for the week of January 18, 2017. The song has sold 128,000 copies in the US as of May 2017.

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