"Funhouse" is the fifth single from American singer-songwriter Pink's fifth studio album of the same name. The track was written by P!nk, Jimmy Harry and Tony Kanal who also produced the song. It holds the title of the album and, just like most of the album's tracks, the song speaks about P!nk's split with Carey Hart. Pink performed the song on September 16, 2009 on the Jimmy Kimmel Live! concert stage.

"Funhouse" received acclaim from critics, being regarded as one of the musical and lyrical highlights of the album. There's More Where That Came From' gave the song an A- stating, "'Funhouse' has the energy of 'So What' but surpasses it half-way through, when the song breaks into true rocker mode. Something we haven’t seen from Pink since 'Trouble' back in 2003!"Billboard also gave the song a very positive review, saying "Pink again displays her versatility on this complex number, which calls for blues, funk and rock vocal stylings that few other pop stars could pull off. The singer delivers with full force, colliding with lively guitar licks and hints of synth" and giving it an 81% approval.

"Funhouse" became Pink's 16th Top 10 single in Australia, climbing to a chart peak of number six on 2 August 2009. The song also became Pink's 5th consecutive #1 single on the Australian Airplay Chart, with all 4 previous singles from Funhouse peaking at #1 too. In New Zealand, the song debuted at number 18 on August 3, 2009, becoming Pink's fifth consecutive top twenty hit from the Funhouse album. It has since peaked at number 15. It also made its chart debut on the Turkey Top 20 Chart at number twenty-five. "Funhouse" first appeared on the UK Singles Chart on July 5, 2009 at number 155. It climbed 30 spots to 125 a week later. It currently peaks at twenty-nine. Also in the UK, the song has been added to the B List of the Radio 1 Playlist. It is expected to climb in the following weeks due to the physical release of the single. In the week of 4 August 2009, "Funhouse" debuted at the Dutch Top 40 at number 31, making this her 19th entry on the chart. "Funhouse" debuted on the Canadian Hot 100 at #80 and has risen to a peak of #21. The song was released on August 25, 2009 in the U.S., and on the week ending October 3, the song debuted at number 23 on the Bubbling Under Hot 100 chart. The following week, the song debuted on the Billboard Hot 100 at #97 and peaked at #44.

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