"The Fighter" is a duet between New Zealand-born Australian country music singer Keith Urban and American country music singer Carrie Underwood. It was released on 6 February 2017 as the fifth single from Urban's ninth studio album, Ripcord, through Hit Red and Capitol Nashville. Urban co-wrote and co-produced the song with busbee.

The song has entered the record charts of Australia, Canada, United States, Belgium and Scotland, where it became Urban's first song to enter the Scottish Singles Chart and Belgium charts.

The song is in the key of B minor with a main chord pattern of G_maj7–A_sus4–F♯_m7–Bm and an approximate tempo of 132 beats per minute. It is about a man promising that he will defend and support a woman.

Urban said of the song's evolution as "I was working with busbee that day; we were in London. I was actually driving to the studio to work on this other song we started, and I had most of it the chorus in my head, and it felt like I had most of the song in my head — the verses just had to flesh out. I walked into the studio and played the chord progression, and he built this track really quickly, and then I could sing over the top of it". He continued and said "it was just a very quick, quick song to write, because I literally thought about Nic and I and our relationship in the beginning, and some of the things we had said all went into that song."

Following the release of the album, "The Fighter" sold 25,000 copies in the first week and debuted at number 25 on the Hot Country Songs chart and also at number 18 on the Bubbling Under Hot 100 Singles chart. In the next week, the song jumped to number 11 on the Hot Country Songs chart and also debuted at number 69 on the US Billboard Hot 100, selling 50,000 copies. It debuted on the Canadian Hot 100 at number 75.

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