t.A.T.u. (Russian: Тату́ pronounced [tɐˈtu]  (listen), transliterated as "tattoo") is a pop duo formed in Moscow, Russia in 1999 by Ivan Shapovalov. The group consists of Lena Katina and Yulia Volkova. Known worldwide, they are the most successful Russian band to date.

Their debut single "Ya Soshla S Uma", Russian version of "All The Things She Said", was released in December 2000. It became a huge hit in Russia and Eastern Europe. In early 2001, Shapovalov signed a recording contract with Universal Music to release the debut album, 200 Po Vstrechnoy. It was released in May of that year and became multi-platinum in Russia and platinum in Europe, making t.A.T.u. the first group from Eastern Europe to get the IFPI platinum award. In late 2002, they released 200 km/h in the Wrong Lane, the English version of 200 Po Vstrechnoy, with the release of this album t.A.T.u. became the first group ever to get the IFPI Europe platinum award for the same album in two different languages. The album also got the diamond certification in Japan and gold in the United Kingdom and the United States. The album's lead single "All The Things She Said" spent four consecutive weeks at the number 1 spot in the UK Singles Chart, and topped the charts internationally.

In May 2003, they represented Russia at the Eurovision Song Contest in Riga, Latvia, with "Ne Ver', Ne Boysia", where they placed third. In 2004, the group took a hiatus after they split from their producer, Ivan Shapovalov, during the Podnebesnaya show.

In October 2005, they released their second album, Dangerous and Moving, and its Russian counterpart, Lyudi Invalidy, which became platinum in Russia. In late 2006, the girls released a Best Of compilation, and then ventured on their own after negotiating out of their contract with Universal Music.

The third Russian studio album, Vesyolye Ulybki, was released in October 2008 in Russia, and its English counterpart, Waste Management, in December 2009 digitally around the world. In 2011 it was confirmed by but Yulia and Lena that t.A.T.u. had broken up.