"Bad Liar" is a song by American singer Selena Gomez. She co-wrote the song with long-time collaborators Julia Michaels and Justin Tranter, and the producer, Ian Kirkpatrick. The track samples the bassline from Talking Heads' 1977 single "Psycho Killer", written by David Byrne, Chris Frantz and Tina Weymouth, who are therefore credited. It was released on May 18, 2017, as a single from her third studio album by Interscope Records. A vertical music video accompanied the release, becoming the first music video to premiere on Spotify, where it was made available exclusively. The song's official music video directed by Jesse Peretz, was released on June 14, 2017 on Gomez's Vevo channel on YouTube, in which she plays four characters.

The song received acclaim from critics, who noted the mid-tempo production for its non-traditional structure in Gomez's catalogue.David Byrne, Talking Heads vocalist, also complimented the song.

"Bad Liar" was written by Selena Gomez, Julia Michaels, Justin Tranter, and Ian Kirkpatrick, the latter of whom also produced the song. Its initial inspiration came from the American band Talking Heads who Gomez and Michaels are fans of. During a session with Gomez and Tranter, Michaels suggested that they should write a song over the bassline of the band's 1977 single "Psycho Killer", specifically interpolating band member Tina Weymouth's riff. The minimal bassline from the song was used as a starting point for "Bad Liar" from which its topline melody developed. In an interview for Variety magazine, Tranter recalled that it was "one of those magical moments where the song just comes together very quickly and felt so good."Warner/Chappell Music executive Greg Sowder played "Bad Liar" to Talking Heads member David Byrne who liked the track and Gomez's vocal performance, and along with Weymouth and Chris Frantz granted permission for it to sample "Psycho Killer".

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