"Wildfire" is a classic song written by Michael Martin Murphey and Larry Cansler. It was originally recorded by Murphey, who had yet to add his middle name to his recorded work, and appears on his gold-plus 1975 album Blue Sky – Night Thunder.

Released in February 1975, as the album's lead single, "Wildfire" became Murphey's highest-charting Pop hit in the United States. The somber story song hit #2 in Cash Box and #3 on the Billboard Hot 100 chart in June 1975. In addition, it hit the top position of the Billboard Adult Contemporary chart, displacing "Love Will Keep Us Together".

The single continued to sell, eventually receiving platinum certification from the RIAA, signifying sales of over two million US copies. Members of the Western Writers of America chose it as one of the Top 100 Western songs of all time.

Murphey and Cansler co-wrote "Wildfire" in 1968, shortly after Murphey emerged as a solo artist. Earlier in the decade he had been part of a duo known as the Lewis & Clark Expedition (which had appeared and performed in an episode of I Dream of Jeannie) in 1968 with his fellow singer-songwriter Boomer Castleman. When Murphey rerecorded "Wildfire" for a new album in 1997, he was quoted by Billboard as saying that what many consider his signature song "broke my career wide open and, on some level, still keeps it fresh. Because that song appeals to kids, and always has, it's kept my career fresh."

In a 2008 interview, Murphey talked about the origins of the song and the context in which it was written. He was a third-year student at UCLA, working on a concept album for Kenny Rogers. The work was demanding, sometimes taking more than twenty hours a day. One night he dreamed the song in its totality, writing it up in a few hours the next morning. He believes the song came to him from a story his grandfather told him when he was a little boy — a prominent Native American legend about a ghost horse. Murphey didn't have a horse named Wildfire until a few years before the interview, when he gave that name to a palomino mare.

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