"This isn't a reunion," the band said on its website, "because we never broke up."
The new album, Save Rock and Roll, will be available worldwide on 6 May. Their official tour also kicked off on Monday night in Chicago.
Their new song, My Songs Know What You Did In the Dark (Light Em Up), is available on iTunes.
'Future of Fall out Boy'
"When we were kids the only thing that got us through most days was music," the band's website statement said. "We needed to plug back in and make some music that matters to us. The future of Fall Out Boy starts now."
Fall Out Boy soared to fame in 2005 with the album From Under the Cork Tree. Hit songs like Sugar, We're Goin Down and Dance, Dance mixed energetic guitars and angst-ridden lyrics.
The group released two more albums in 2007 and 2008 but went on an indefinite hiatus in 2009.
The band's members include bassist and lyricist Pete Wentz, vocalist and guitarist Patrick Stump, guitarist Joe Trohman and drummer Andy Hurley.
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