Today Is A Beautiful Day is the second studio album by Japanese J-pop band Supercell, released on March 16, 2011 by SME. The album contains 13 music tracks written by Ryo, and sung by Nagi Yanagi, though officially Yanagi is not a member of Supercell. Five of the tracks were previously released on three of Supercell's singles. Two different editions of the album were released: a regular CD version and a CD+DVD limited edition. Today Is A Beautiful Day peaked at No. 3 on the Japanese Oricon weekly albums chart, and in July 2011 was awarded a Gold Disc by the Recording Industry Association of Japan for having exceeded 100,000 copies shipped in a single year.

Five of the songs were used as theme songs for various media: "Kimi no Shiranai Monogatari" was used as the ending theme to the 2009 anime television series Bakemonogatari; "Hero" was the theme song to Shueisha's manga magazine Aoharu, a special edition version of Young Jump; "Love & Roll" was the theme song to the 2009 anime film Cencoroll; "Hoshi ga Matataku Konna Yoru ni" was used as the ending theme to Type-Moon's visual novel Mahōtsukai no Yoru; and "Utakata Hanabi" was used as the 14th ending theme for the Naruto: Shippuden anime series.

Up to and including the release of Supercell's debut album Supercell (2009), songwriter Ryo had been using the Vocaloid singing synthesizer software Hatsune Miku for the vocals of the songs he produced. In transitioning to a human singer, then 21-year-old singer Nagi Yanagi was approached by Ryo to sing the vocals for Supercell's debut single "Kimi no Shiranai Monogatari" (2009). Yanagi had previously submitted cover versions of songs to the Nico Nico Douga video sharing website under the name Gazelle, and Ryo had been a fan of her voice even before uploading his own songs to Nico Nico Douga in late 2007. According to Ryo, other staff members wanted to try having all the songs on the album sung by different artists, but Ryo wanted her for the entire album. Thus, Supercell decided to stick with Yanagi as the vocalist for their second album. The album's title was partially inspired by the 2010 film Confessions and its accompanying theme song "Last Flower" by Radiohead. Ryo was impressed by the melancholic feel of the song in a film that expresses the theme that "life is wonderful," and he wanted to go with a title whose meaning would change depending on how it is perceived. In doing so, Ryo suggests that the title Today Is A Beautiful Day can be taken literally or sarcastically.

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