"The Best Damn Thing" is a song by Canadian singer-songwriter Avril Lavigne, taken from her third studio album of the same name (2007). The song was released as the fourth and final single from the album only in some European countries and in Brazil during June 2008. The song was written by Lavigne and Butch Walker, and was produced by Walker. The song is a pop punk track about female self-confidence, containing a spell out of her name, in the style of an American football cheer, with each letter spelling out a different way in which a girlfriend deserves to be treated.

The song received mixed reviews from music critics, some citing its similarities to Toni Basil's song "Mickey", and comparing it to her previous single "Girlfriend". Commercially, the song failed to make any significant impact on the charts, peaking outside the top-forty in most countries. However, it achieved platinum status in Brazil, for selling over 100,000 copies. A music video for the song was directed by Wayne Isham, featuring Lavigne as the leader of a cheerleading group, wearing a pink wig whilst playing an electric guitar, and with her band. She performed the song only on her "Best Damn Tour" (2008).

After success of the first two singles from "The Best Damn Thing" (2007), "Girlfriend" (which topped the Billboard charts, among others) and "When You're Gone" (which became a top-ten hit in many countries), Lavigne released the song "Hot as the album's third single, however, the song didn't prove to be a success in the United States, whilst it charted very moderate in other countries. After rumors about releasing the song "Innocence" as the next single,Sony BMG announced that the title track would be released as the album's fourth single in May 2008. According to a press release, the music video for "The Best Damn Thing" would be shot soon and her older brother Matthew who made a cameo as a bass player in her "Girlfriend" music video would star in the video. The song was released in a few places of Europe, including Brazil,Germany, on June 6, 2008 and elsewhere on June 21, 2008.

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