"Spark the Fire" is a song recorded by American singer and songwriter Gwen Stefani. The song was released on December 1, 2014. It was originally intended to be featured on Stefani's third studio album This Is What the Truth Feels Like, but it was scrapped in favor of new material. Stefani wrote "Spark the Fire" in collaboration with the song's producer Pharrell Williams. It is a dance-pop and hip hop track that incorporates funk. Along with the previous single, "Baby Don't Lie", the track was marketed as Stefani's musical comeback as a solo artist.

Critical responses to "Spark the Fire" were mixed with critics negatively comparing it to Stefani and Williams' previous collaboration "Hollaback Girl", while others favored it compared to "Baby Don't Lie". Lyrically, the song serves as a "comeback", discussing topics such as partying, having a good time, and feminism. "Spark the Fire" charted on Russia's music chart at number 326, failing to impact any other country's main chart, managing only to peak on the lower ends of the US Dance Club and Pop Digital Songs charts. Stefani performed the song live during various public appearances, including The Tonight Show Starring Jimmy Fallon where she performed it alongside a medley mix of her previous singles.

After releasing two solo albums, Love. Angel. Music. Baby (2004) and The Sweet Escape (2006), Stefani returned to work with her band No Doubt, and in 2012 they released their sixth studio album, Push and Shove. During that time, she claimed, "I never need to do that or want to do it again. I'm happy being in No Doubt." However, after an appearance during Pharrell Williams' performance at the 2014 Coachella Valley Music and Arts Festival, Pharrell teased that the rare live appearance from Stefani was the start of a comeback effort for the singer. Shortly after her Coachella performance, Stefani performed "Hollaback Girl" live on The Voice to further promote her upcoming role on the show.

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