"Galaxy Supernova" is the eighth Japanese single by South Korean girl group Girls' Generation. It was included on the group's third Japanese studio album Love & Peace and was released as the second single from the album on September 18, 2013. The song was written by Frederik Tao Nordsø Schjoldan, Fridolin Nordsø Schjoldan, Kamikaoru, and Martin Hoberg Hedegaard, whilst production was handled by Nozomu Tsuchiya. Musically, "Galaxy Supernova" is an electropop song.

The song received generally favorable reviews from music critics, who praised its music styles and compared the song to the group's previous Japanese singles "Mr. Taxi" and "Paparazzi". The song peaked at number three on the Japanese Oricon Singles Chart and number four on the Japan Hot 100. A music video for the track was released on September 5, 2013. To promote the song, Girls' Generation performed live on music shows Secret Live and Live Monster in Japan.

"Galaxy Supernova" was written by Frederik Tao Nordsø Schjoldan, Fridolin Nordsø Schjoldan, Kamikaoru, and Martin Hoberg Hedegaard, whilst production was handled by Nozomu Tsuchiya. It is an electropop song that features "pulsing" synthesizers in its composition. It was released as the second single from Girls' Generation's third Japanese album Love & Peace on September 18, 2013. The album was subsequently released in December 2013.

It was released as a CD single in Japan by Nayutawave Records, and includes the B-side track "Do the Catwalk". Meanwhile, the digital single was released in several Asian countries including Japan, Hong Kong, Singapore and Taiwan by Universal Music Group. A limited CD + DVD edition of the single, which included a bonus music video for "Galaxy Supernova", was released in Japan by Nayutawave Records. "Galaxy Supernova" was used in an advertisement campaign for Samantha Thavasa Jeans, the first jeans line from Japanese fashion company Samantha Thavasa, in conjunction with the group's endorsement deal with the brand.

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