"St. Elmo's Fire (Man in Motion)" is a song by British singer John Parr from the 1985 film St. Elmo's Fire. It hit #1 on the US Billboard Hot 100 chart on 7 September 1985, remaining there for two weeks. It was the main theme for Joel Schumacher's film, and first single from the soundtrack. The song was created and edited within 24 hours.

The record peaked at #6 in the United Kingdom, Parr's home country, and became a #1 hit for him around the world, and provided many awards and a Grammy nomination.

The song did not initially feature on Parr's studio albums, only appearing on the London Records re-release of his self-titled debut album in the United Kingdom.

Members of the bands Toto, REO Speedwagon and Mr. Mister appear on the recording.

The music video features all seven of the main cast of the film St. Elmo's Fire looking sadly through the foggy windows of a run-down and fire-damaged version of the St. Elmo's Bar set. The video was directed by Kort Falkenberg III, who devised the concept with the film's director, Joel Schumacher. The production company only had Parr for a single day before he had to go back to England, so the shoot had to be done in exactly 24 hours.

The Canadian version of the video intersperses images of Rick Hansen's trek with those of the film.

The ending of the video shows Parr singing to each individual cast member from the film before he disappears into the night, and the cast follows him.

"You broke the boy in me, but you won't break the man."