Epic Day is the nineteenth studio album by the Japanese rock duo B'z. It was released on March 4, 2015, more than 3.5 years after their previous studio effort, C'mon, their longest gap between studio albums. It came after a hiatus in which the members released solo projects, including vocalist/lyricist Koshi Inaba's Singing Bird and guitarist/composer Tak Matsumoto's New Horizon.

It debuted at #1 at both the Oricon weekly albums chart and the Billboard Japan album chart.

The album comes in four versions: the regular edition with the 10-track CD; the analog edition with a download card; the limited edition with a bonus live DVD; and the Live-Gym 2015 Edition with live goods.

The opening track "Las Vegas" received a promotional video and will be used as the official song of the Japanese leg of the 2015 Red Bull Air Race World Championship season.

All lyrics written by Koshi Inaba; all music composed by Tak Matsumoto, all songs co-arranged by both.

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