Ganging Up on the Sun is the fifth studio album by the rock band Guster. It was released on June 20, 2006. The first single, "One Man Wrecking Machine", was released in late 2005 and its follow-up, "Satellite", in March 2006. It is Guster's second studio album with Joe Pisapia, his first as a full member. The title comes from a line in the song "Manifest Destiny": "The moon and stars are ganging up on the sun".
On May 5, 2021, the band announced a digital re-release of the album in an expanded form, with 24 tracks. This coincided with "Emily Ivory" being released for the first time, 15 years after it was teased in the studio documentary Joe's Place. The expanded edition of the album includes "Emily Ivory", four b-sides previously released on Satellite EP, "Sorority Tears" and "On My Own", both of which were unofficially released on The Pasty Tapes, two cover songs, two demos, and a remix.