Shudder is the fourth studio album by American rock band Bayside, released on September 30, 2008. Prior to its release, singer Anthony Raneri described the album as having a more alternative sound than their previous record The Walking Wounded. The title comes from a lyric in the track "I Can’t Go On".
On July 17, 2008, Shudder was announced for release in October. The band had played "I Think I’ll Be Ok" at shows during the summer of 2008. On August 27, the album's track listing was revealed. In addition, it was mentioned that the album would be released slightly earlier in September. On September 10, "No One Understands" was made available for streaming. On September 19, Shudder was made available for streaming through the group's Myspace profile, before being released on September 30 through independent label Victory Records. In October and November, the band went on a headlining tour of the US with support from the Status, Valencia and the Matches. On October 15, a music video was released for "No One Understands". "You’ve Already Been" was added as an iTunes bonus track, and later appeared on the Take Action! Vol. 8 compilation CD/DVD. In December, the band co-headlined a tour of the UK with Hit the Lights. They were supported by Oh No Not Stereo. In February and March 2009, the band toured Australia as part of the Soundwave festival. Between late March and early May, the band supported New Found Glory on their headlining tour of the US. The band appeared at The Bamboozle festival in early May. Between late June and late August, the band performed on the Warped Tour.