"Who You Love" is a song written and performed by John Mayer and Katy Perry for Mayer's sixth studio album, Paradise Valley (2013). It appears as the sixth song on the album and is the third single from the record. Mayer co-produced the song with Don Was and released it as an Internet download on August 12, 2013. Lyrically, "Who You Love" is a ballad about accepting falling in love with someone, on the theory that "you love who you love". The song has been praised by critics and has received mostly positive reviews.

Mayer has stated that his relationship with Perry has been a private and "human" one. On writing the song, Mayer said: "Who You Love" is a sweet melody that tells the story of opening your heart up and allowing yourself to fully love the person in your life—or specifically to "love who you love, who you love." "It was a really great experience and the song is one of these like old FM '70s and '80s sort of like duets, and I listened back to it; it's, like, really convincing. And I watched it get made and I'm still kind of taken aback." Mayer also stated in an interview with Billboard magazine that the general idea behind the song can be best described as, "I love you based on the fact that I've tried to run and I'm not running and I give up." In regards to Perry writing the lyrics to her part of the song herself he said that "it was a really fun opportunity for her to write like, her answer to that." During a speech at Oxford University, Mayer mentioned the song, saying "I wouldn't have brought [Perry] a song if I didn't think it was good and great and she wouldn't have said she would do it if she didn't think it was going to be great. So it was a completely artistic transaction." Perry described their duet as "incredible", adding: "I'm so proud of it because people hear it, and they hear a different side of me."

"Who You Love" has a length of four minutes and twelve seconds. According to digital sheet music published at Musicnotes.com by Sony-ATV Music Publishing, the song is written in the key of A major and the tempo moves at moderate pace of 144 beats per minute. Mayer and Perry's vocal range in the song spans from the lower note of E₃ to the higher note of D₅.

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