Non-album songs
- "Nobody Wants to Be Lonely" (with Ricky Martin, 2001)
- "Lady Marmalade" (with Lil' Kim, Mýa and Pink, 2001)
- "Car Wash" (featuring Missy Elliott, 2004)
- "Tilt Ya Head Back" (with Nelly, 2004)
- "We Remain" (from The Hunger Games: Catching Fire, 2013)
- "Say Something" (with A Great Big World, 2013)
- "Change" (2016)
- "Telepathy" (featuring Nile Rodgers, 2016)
As Featured Artist
- File:What's Going On.jpg "What's Going On" (with Artists Against AIDS Worldwide, 2001)
- File:El Ultimo Adios.jpg "El Ultimo Adios (The Last Goodbye)" ( (with various artists), 2001)
- File:Somos Novios.jpg "Somos Novios (It's Impossible)" (Andrea Bocelli featuring Christina Aguilera, 2006)
- File:Tell Me.jpg "Tell Me" (Diddy featuring Christina Aguilera, 2006)
- File:Moves like Jagger.jpg "Moves like Jagger" (Maroon 5 featuring Christina Aguilera, 2011)
- File:Feel This Moment.jpg "Feel This Moment" (Pitbull featuring Christina Aguilera, 2013)
- File:Do What U Want.jpg "Do What U Want" (Lady Gaga featuring Christina Aguilera, 2014)
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