"Gomenasai" is a song by Russian recording duo t.A.T.u., taken from their second English language studio album Dangerous and Moving (2005). The song was written by Martin Kierszenbaum, and production was handled by Kierszenbaum and Robert Orton. The song was released in May 2006 as the album's third single by Interscope. The song was not initially supposed to be a single from the studio album as t.A.T.u. did not approve; however Interscope ignored the band's wishes and went forward with the single anyway. Due to conflicts with the label, "Gomenasai" was t.A.T.u's last single with Interscope.

t.A.T.u. are a Russian pop duo consisting of Lena Katina and Julia Volkova. The two started out as part of the children's musical group Neposedy before being managed by producer and director Ivan Shapovalov and signing with Russian record label Neformat. t.A.T.u.'s debut album 200 Po Vstrechnoy (2001) was a commercial success in Eastern Europe, and that resulted in the duo signing with Interscope Records to release its English-language counterpart, 200 km/h in the Wrong Lane (2002). The album was certified platinum by the IFPI for one million copies sold in Europe and became the first album by a foreign group to reach number one in Japan. It was also certified gold in the United States and included the international hits "All the Things She Said" and "Not Gonna Get Us". The duo represented Russia in the Eurovision Song Contest 2003 with the song "Ne ver', ne boysia", finishing third.