A list of songs Katy Perry has written for other artists.
- "Love Is a Train" (Initially for The Matrix's self-titled debut album, but later given to Ashley Tisdale for Guilty Pleasure, written with Lauren Christy, Graham Edwards, and Scott Spock)
- "Passenger" (Britney Jean, written with Britney Spears, Sia Furler, Andrew Swanson, and Thomas Pentz)
- "Black Widow" (Initially for Perry's album, Prism, but later given to Iggy Azalea for The New Classic, written with Tor Erik Hermansen, Mikkel Storleer Eriksen, Benjamin Levin, Sarah Hudson, and Amethyst Kelly)
Jessie James Decker
- "Bullet" (Jessie James, written with Jessie James Decker, Ted Bruner, and Trey Vittetoe)
- "Girl Next Door" (Jessie James, written with Ted Bruner and Trey Vittetoe)
- "Wish You the Worst" (Kady Malloy, written with Adrienne Follesé, Keith Follesé, and Nick Trevisick)
- "I Do Not Hook Up" (All I Ever Wanted, written with Greg Wells and Kara DioGuardi)
- "Long Shot" (All I Ever Wanted, written with Glen Ballard and Matt Thiessen)
- "Get on Your Knees" (The Pinkprint, written with Chloe Angelides, Henry Walter, Jacob Kasher Hindlin, Dr. Luke, Nicki Minaj, and Sarah Hudson)
Selena Gomez & the Scene
- "Rock God" (Initially for Perry's album, (A) Katy Perry, but later given to Selena Gomez & the Scene for A Year Without Rain, written with Priese Board and Victoria Horn)
- "That's More Like It" (When the Sun Goes Down, written with Josh Alexander and Billy Steinberg)
Truth & Salvage Co.
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