Kurutta Taiyou

Kurutta Taiyou (狂った太陽, "Lunatic Sun") is the sixth studio album by the Japaneserock band Buck-Tick. It was released on cassette and CD on February 21, 1991, through Victor Entertainment. The album was digitally remastered and re-released on September 19, 2002, with two bonus tracks. It was remastered and re-released again on September 5, 2007. "Speed", "M・A・D" and "Jupiter" were later re-recorded for the group's compilation album Koroshi no Shirabe: This Is Not Greatest Hits (1992).

The album peaked at number two on the Oricon charts. It was certified platinum (400,000 copies sold) within a month of its release, and has sold 326,580 copies during its run in the Oricon album chart.

The album earned the band a nomination for Best Album at the 33rd Japan Record Awards. It was named number 40 on Bounce's 2009 list of 54 Standard Japanese Rock Albums.