Chuck is the third studio album by Canadian rock band Sum 41. The album was released on October 12, 2004. It is the band's last album to feature lead guitarist Dave Baksh until his return in 2015. Chuck peaked at No. 2 on the Canadian Albums Chart and No. 10 on the US Billboard 200, making it the band's highest-charting album until it would be surpassed by Underclass Hero in 2007.

The album's lyrical content has been described as darker and more mature than the band's previous work, with subjects on politics being driven by the band's experience in the Congo while shooting a documentary film.

The album had a slightly different sound from the band's previous work, mixing in their punk rock influence with heavy metal and adult alternative. The album proved to be a success, receiving acclaim from both critics and fans, as well as selling over 5 million copies. Singles such as "We're All To Blame" and "Pieces" gained success on the Canadian and American charts, and the album won a Juno Award for "Rock Album of the Year" in 2005.

The band's previous album Does This Look Infected became a commercial and critical success, and the band went on a tour in the album's support. In mid-2004, the band took a break from touring and filmed a documentary for War Child Canada in the Congo. The film was called Rocked: Sum 41 in Congo and was released in 2005 by MTV. However, fighting broke out during the filming while the band was staying in a hotel.

"The shooting was all around us, and all these people were waiting, probably to die" said drummer Steve Jocz, reflecting on the experience. "Two UN people arrived at the scene and gave a speech about how everything would be fine" bassist Jason McCaslin mentioned "And then after they left, things just went crazy".

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