Yulia Olegovna Volkova (Russian: Юлия Олеговна Волкова born 20 February 1985), better known by the alternative spelling of Julia, is a Russian singer, recording artist and actress, best known for being a member in the Russian girl group t.A.T.u., along with Lena Katina. A girl group who was managed in Moscow, Russia by Ivan Shapovalov in March 1999, the group signed a record deal with Universal Music Russia, where they eventually signed to Universal's sub-label Interscope Records in 2001.

The group's first single "All the Things She Said" topped the charts in countries including Australia, Austria, Denmark, Italy, Japan, New Zealand, Switzerland, the United States, and the United Kingdom, but also received controversy due to Julia and Lena kissing onscreen. The group recorded three studio albums in English, including their best-selling (to date) studio album, 200 km/h in the Wrong Lane, three Russian albums, and four compilation albums. The group also worked on alternative projects, including a 2011 film You and I, and opened a Russian-based record label entitled T.A. Music. Suddenly, in March 2011, t.A.T.u.'s management released a press release officially stating that t.A.T.u. had split, due to conflict and problems surrounding the members.

Julia signed a solo career with Gala Records in June 2011, and released her debut single "All Because of You" in November 2011. The song was also released in a Russian-language version under the title "Сдвину мир" (I'll Change the World). In July 2012, it was announced by her management that Julia would release her debut worldwide single entitled "Didn't Wanna Do It", which was released on 21 August 2012. She is also currently recording her first solo studio album.