"Play with Fire" is a song recorded by American singer Hilary Duff for her fourth studio album, Dignity (2007). It was written by Duff, Kara DioGuardi, Rhett Lawrence and will.i.am and produced by Lawrence. The song was sent to mainstream radio in the United States on August 21, 2006, as the lead single from Dignity.

"Play with Fire" is an electropop and a techno song.

"Play with Fire" was formerly called "Happy" but the song's lyrics and instrumentals were changed, and "Happy" became a separate track on Dignity. The song is played during the first club scene in the 2006 film Material Girls, in which Duff stars.

According to Duff, "Play with Fire" and the other songs on the album are "more dancey" than her previous efforts and make use of more real instruments. "[I]t's fun and funky and different, something new for me. It's really cool", she said. She also described the album's sound as "a little less pop-rock and more electronic-sounding. It has a lot of dance melodies." The "" release of the single in advance of the album was, as she put it, "to give listeners a chance to get into my new sound, which matches the whole dance/electronic rock sounding vibe."

Billboard magazine's Chuck Taylor described the song as being "less of the clichéd little-girl-playing-tough-pop/rocker than it is a truly intriguing exploration into darker, more experimental melodic structures that could attract a whole new crowd of late-night dancefloor minions to the Duff camp." Allison Stewart, in a negative review of Dignity for The Washington Post, wrote that the song "boasts what may be the best kiss-off in months ("I don't have time for this, I'm off to play in Houston"), even if most of Duff's tween audience can't exactly claim it for everyday use." Dave de Sylvia of Sputnikmusic also gave a negative review deeming the song as "awful". David Sanford of About.com gave the Richard Vission remix of the song a positive review, commenting the song is "perfect for those DJs who just can't admit to playing a Hilary Duff record."Richard Vission created remixes of the song, and Billboard called the Richard Vission radio edit "a true work of art, refashioning Duff as a potential innovator — and heaven knows there are precious few of those these days ... It will be fascinating to see if this is an enchanting fluke, or if America is destined to at last see the arrival of its own Kylie."

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