Living in sin may refer to:

• Cohabitation, pejoratively; a romantic couple living together while remaining unmarried

• Living in Sin (EP), a 2020 EP by Hooligan Hefs
• "Living in Sin" (song), a 1989 song by Bon Jovi
• "Living in Sin", by Richard A. Whiting, 1931
• "Living in Sin", a song by Gene Simmons from the 1978 album Gene Simmons
• "Living in Sin", a song by Hawaii form the 1983 album One Nation Underground
• "Living in Sin", a song by Mammal from the 2000 album Vol 2: Systematic/Automatic
• "Living in Sin", a song by Virgin Steele from the 1982 album Virgin Steele

• Living in Skin, a 2000 studio album by Jason Harrod
• Understanding New Jersey & Living in Sin, a 2000 album by Vic Ruggiero