"Sen to Rei" is a song by Japanese band Sakanaction. It was released as a digital download on November 12, 2008, and on December 10 was released as the band's first physical CD single.

Sakanaction , stylised as sakanaction, are a Japanese rock band from Sapporo, Hokkaido. Their music is a fusion of alternative rock, electronic, pop, and new wave styles. The band consists of five members: Ichiro Yamaguchi, Motoharu Iwadera, Ami Kusakari, Emi Okazaki, and Keiichi Ejima.