"Billie Jean" is a dance-pop R&B song by American recording artist Michael Jackson. It was written by Jackson and produced by Quincy Jones for the singer's sixth solo album, Thriller (1982). Originally disliked by Jones, the track was almost removed from the album after he and Jackson had disagreements regarding it. There are contradictory claims to what the song's lyrics refer to. One suggests that they are derived from a real-life experience, in which a mentally ill female fan claimed that Jackson had fathered one of her twins. Jackson himself, however, stated that "Billie Jean" was based on groupies he had encountered. The song is well known for its distinctive bass line and Jackson's vocal hiccups. The song was mixed 91 times by audio engineer Bruce Swedien before it was finalized.

Following the successful chart performances of the single "The Girl Is Mine" and the album Thriller, "Billie Jean" was released on January 2, 1983, as the collection's second single. It became a worldwide commercial and critical success; "Billie Jean" was one of the best-selling singles of 1983, and topped both the US and UK charts simultaneously. In other countries, "Billie Jean" topped the charts of Spain and Switzerland, reached the top ten in Austria, Italy, New Zealand, Norway and Sweden, and peaked at number 45 in France. Considered to be one of the most revolutionary songs in history, "Billie Jean" was certified platinum by the Recording Industry Association of America (RIAA) in 1989.