"You Are Not Alone" is the second single from Michael Jackson's album HIStory. The R&B ballad's composition has been attributed by R. Kelly in response to difficult times in his personal life. He then forwarded a bare demo tape to Jackson, who liked the song and decided to produce it with Kelly. Jackson's interest in the song was also linked to recent events in his personal life. However, the song has been faced with allegations of plagiarism by two Belgian songwriters. The song was later covered by R. Kelly himself as a hidden track on his tenth studio album Love Letter.
The vast majority of critical reaction to "You Are Not Alone" was positive, although it did not attain unanimous praise. The song was the recipient of Grammy and American Music Award nominations. The corresponding music video, which featured Jackson and his then-wife Lisa Marie Presley was also notable for its scenes of semi-nudity.
Commercially, the song was a significant success. It holds a Guinness World Record as the first song in the 37-year history of the Billboard Hot 100 to debut at number one; it was later certified platinum by the RIAA. The song peaked highly in all major markets. "You Are Not Alone" was Michael Jackson's last number one hit song in the United States during his lifetime. It was also the 800th number one hit on the Billboard Hot 100 pop singles chart.