Christina Aguilera is the debut studio album by American singer Christina Aguilera. It was released on August 24, 1999, by RCA Records. After recording "Reflection", the theme song for the 1998 Disney film Mulan, RCA laid the foundation for the album immediately and started presenting Aguilera with tracks for her debut album, which they originally decided would have a January 1999 release. Its music incorporates dance-pop and teen pop genres, with a few songs featuring strong elements from soul and contemporary R&B. Contributions to the album's production came from a wide range of producers, including David Frank, Ron Fair, Guy Roche, Robin Thicke, Matthew Wilder and Aaron Zigman.

The album received mostly positive reviews, with critics praising Aguilera's vocal performance and technique. It was later included on the List of 200 Definitive Albums in the Rock and Roll Hall of Fame. It debuted at number one on the US Billboard 200 with first-week sales of 253,000 copies. The album was certified octuple platinum by the Recording Industry Association of America (RIAA) and has sold over nine million copies in the US and is one of the best-selling female albums. It remains Aguilera's best-selling album, with sales of over 14 million copies worldwide. The album earned Aguilera the Grammy Award for Best New Artist at the 42nd Annual Grammy Awards.

The album spawned four hit singles; "Genie in a Bottle" peaked atop the record charts in 21 countries, including the US Billboard Hot 100, while two subsequent singles, "What a Girl Wants" and "Come On Over Baby (All I Want Is You)", also topped the chart and "I Turn to You" reached number three. Furthermore, Aguilera embarked on her debut headlining concert tour in 2000.