A list of songs Katy Perry has written for other artists.

Ashley Tisdale

• "Love is 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)

Becca

• "In Between" (TOKYO-O-ING, written with Meredith Brooks)

Jessie James

• "Bullet" (Jessie James, written with Jessie James, Ted Bruner, and Trey Vittetoe)
• "Girl Next Door" (Jessie James, written with Ted Bruner and Trey Vittetoe)

Kady Malloy

• "Wish You the Worst" (Kady Malloy, written with Adrienne Follesé, Keith Follesé, and Nick Trevisick)

Kelly Clarkson

• "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)

Lesley Roy

• "Slow Goodbye" (Unbeautiful, written with Lesley Roy, Dr. Luke, and Max Martin)

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.

• "Old Piano" (Truth & Salvage Co., written with Tim Jones and Brian Wright)