Reason to Believe is the ninth studio album by the American punk rock band Pennywise, which was released on March 25, 2008 as a worldwide free digital download on MySpace. MySpace Records released the album within the United States as a standard CD and a limited-edition vinyl version with two bonus tracks not available in any other format. The album was available in Europe on March 24 through Epitaph Records. Originally to be released in 2007 based on the two year gaps between the last eight studio albums, a tentative title for the album was Free for the People, but the title was scrapped.
Some copies of this album have the Parental Advisory label on the cover. This is the first time a Pennywise album would have a Parental Advisory label on some album covers, even though many of their previous albums contain profanity.
Reason to Believe peaked at #98 in the United States on the The Billboard 200, and #46 in Australia on the ARIA Albums Chart, the band's second lowest position on that chart since the critically acclaimed but commercially unsuccessful 1995 album About Time.
Reason to Believe was the last Pennywise album to feature Jim Lindberg on vocals, after his departure from the band in August 2009.