"Hopelessly Devoted to You" is a song recorded by British-Australian singer, songwriter and actress Olivia Newton-John for Grease: The Original Soundtrack from the Motion Picture (1978).

It was written and produced by John Farrar and originally performed by Newton-John in the film version of the musical Grease (1978).

In 2012, Blaine Anderson (Darren Criss) covered the song for the Glee episode, "The Role You Were Born to Play".

Farrar, Newton-John's personal producer, wrote the song and submitted it to the film's production team.

In 1994, English singer Sonia took over the role of Sandy in a West End production of Grease, replacing Debbie Gibson.