Century Child is the fourth studio album by Finnish symphonic metal band Nightwish. It was released in 2002 through Spinefarm Records in Finland, Drakkar Entertainment in the rest of Europe, Century Media Records in the US, and Toy's Factory in Japan. It is the first album which features now-former bassist and male vocalist Marko Hietala, who left the band in January 2021. It is also the first Nightwish album to feature an orchestra.

Spinefarm Records released a 2-CD special edition of the album in 2002. It includes liner art with the band members' signatures, and a Video CD containing the music video for their cover of Gary Moore's "Over the Hills and Far Away". In addition, the booklet contains an ID code that allows the owner to download the entire album and three extra tracks from the Internet for a limited time. The bonus tracks are "Nightwish", "The Forever Moments" and "Etiäinen", all from the band's first demo of 1996.

The album was certified double platinum in Finland with more than 60,000 sold copies, the second best selling album of 2002 in Finland. Century Child has sold more than 80,000 copies in Finland alone.