"Hopelessly Devoted to You" is a song written by John Farrar. It was originally performed by Olivia Newton-John in the film version of Grease. The song received an Oscar nomination as Best Original Song, losing to "Last Dance" from Thank God It's Friday at the 51st Academy Awards.

Halfway through shooting the movie, Newton-John's contractually-entitled vocal solo had still not been written. Farrar, Newton-John's personal producer, wrote the song and submitted it to the film's production team. Though reluctant at first, they eventually approved it; shooting and recording took place after the rest of the film had been completed.

Newton-John performed the song at the 21st Grammy Awards. It reached number three on the Billboard Hot 100 and number seven on the Easy Listening chart. On the country chart, "Hopelessly Devoted to You" peaked at number twenty and was her first top twenty country hit in two years. The song bears similarity to Cilla Black's 'I Only Live To Love You' (1967).

Although the song was not part of the original musical production, it was kept for the 2016 Grease: Live performance, sung by Julianne Hough.

In 1994, Sonia took over the role of Sandy at a West End production of Grease, replacing Debbie Gibson. In conjunction, she released a cover version of the song. The single was released in June 1994 as a non-album single. It has a double A-side released as a B-side "The Anthem Medley". On the 12-inch single, "The Anthem Medley" was released as the A-side and "Hopelessly Devoted to You" as the B-side. The music video for Sonia's version of "Hopelessly Devoted to You" features Sonia walking through an old city and singing. The music video for "The Anthem Medley" features Sonia dancing and singing in a nightclub. The single become her first not to reach top forty in the United Kingdom, where it peaked at number sixty-one.

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