"You Ain't the Only One" is a song by American singer Mary J. Blige. It was written by Blige along with Patrick "Pat" Kelly, Jezus Rose, and Angelo "Doc" Velasquez for her fifteenth studio album Gratitude (2024), while production was overseen by Kelly, Velasquez, Aidan Brody and Will Campbell. The song was released by Mary Jane Productions Inc. and 300 Entertainment on October 18, 2024, as the album's second single and became Blige's tenth chart topper on the US Adult R&B Songs chart. It has also reached number 18 on Billboard's US R&B/Hip-Hop Airplay chart.