"Rockstar" is the fifth U.S. single by the Canadian alternative rock band Nickelback from their fifth album, All the Right Reasons (2005). It was initially only released in the United States and Canada, and has since been re-released worldwide. The lyrics feature the pretentious, materialistic desires of a wannabe rockstar, who desires lots of money, cars and women. Spoken-word vocals between each verse are provided by Billy Gibbons of ZZ Top.

"Rockstar" is Nickelback's most popular single ever, peaking at number two in the United Kingdom and being certified Platinum. It has also sold 4.5 million copies in the United States.

Rolling Stone ranked "Rockstar" at number 100 in their list of the 100 best songs of 2007. Aside from its praise from Rolling Stone and popularity, some have even labeled it one of the worst songs of all time. "Rockstar" was listed at number 2 in BuzzFeed's list of the 30 worst songs ever written stating that "If aliens came to earth and asked why everyone hates Nickelback so much, this song would be a perfect explanation." A 2008 Popjustice poll voted "Rockstar" as the worst single of the year.The Guardian's Peter Robinson claimed that the song was "...a Smack the Pony skit without the laughter track; ironic, given that Rockstar is one of the most unintentionally hilarious songs of the last few years. It is also one of most confusing." He concluded his review by stating, "In summary, this song makes literally no sense and is the worst thing of all time."

The song was used to mock the band. The first panel of a 2008 Cyanide and Happiness webcomic shows Kroger performing the chorus, only for one of the strip's characters to come in in the second panel and say "yes you do, Chad Kroeger. Yes you do" to Kroger's apparent dejection. In August of that year, the song appeared in a "banned" commercial for British sofa retailer DFS in the United Kingdom featuring actors miming it while playing air guitar in front of sofas. Four months later, the advert was recognized as one of the worst of all time by a Scottish newspaper.

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