"Living in Sin" is a song by American rock band Bon Jovi. It was written by lead singer Jon Bon Jovi. It was released in 1989 as the fifth single from the band's fourth album New Jersey. It also was the fifth single from New Jersey to chart in the Top 10, allowing Bon Jovi to hold the record for the most songs from a hard rock album to reach the Top 10 of the Billboard Hot 100. It peaked at #9 on that chart and #37 on the Mainstream rock charts.

The song, which has a slow beat, strong bass rhythm by former bass guitarist Alec John Such, an emotional delivery of lyrics, driving guitars, and interspersed keyboards, discusses cohabitation and argues that true love is stronger than anything, despite what other people may say ("I call it love, they call it living in sin").

When performed live, the band often play a short cover of "Chapel of Love" during the outro of the song.

The music video for the song was filmed in all black and white, just like "Born to Be My Baby." While the video does feature some shots of the band performing, primarily of Jon Bon Jovi and Richie Sambora, most of the video focuses on a fictional young couple and their struggle to sustain a relationship despite the disapproval of the girl's parents. The video is noted for several of its steamy romance/sex scenes, including on a beach, in a car, and in a hotel room. The final scene of the video shows the girl running away from home to meet up with her boyfriend, and then the girl's parents walking in on them sleeping together in a hotel room. They take her home, and the video ends when the boyfriend driving in his car to the girl's home, where she snap-decides to run away with him.

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