"My Boy" is a song by American singer Billie Eilish from her debut EP Don't Smile at Me (2017). It was released as a single on July 28, 2017. The song was featured in an episode of the American television series Shadowhunters, titled "Thy Soul Instructed", which is the fourth episode of the third season in the series. A remix of the song by TroyBoi titled "MyBoi" was released on March 9, 2018.