Complete Best is a greatest hits album by Canadian singer Celine Dion, released on 27 February 2008 in Japan. It reached number three on the Oricon Albums Chart, was certified Gold by the RIAJ and has sold 173,100 copies in Japan in 2008.

Complete Best was released just a few days before Dion's sold-out concerts in Japan, which were a part of the Taking Chances World Tour. The compilation includes "To Love You More," which was originally released in October 1995 and became Dion's biggest hit in Japan, topping the singles chart for four weeks and selling 1.5 million copies. It also features two other singles exclusive to Japan: "The Power of the Dream" and "Be the Man", as well as many of Dion's other hits.

The new single, "A World to Believe In" (U.S.A. Mix), was included as the first track of the compilation. Recorded as an English-Japanese duet with Yuna Ito, the song was released in January 2008, peaking at number eight on the Oricon Singles Chart. It was Dion's first appearance on the chart since "To Love You More" (Dance Mixes) entered it in April 1999. The duet wasn't available on Dion's previous album, Taking Chances, which includes the original English solo version of the song.

In October 2008, another greatest hits album was released internationally, titled My Love: Essential Collection. Due to the recent release of Complete Best, this compilation was not released in Japan. However, new unreleased tracks from My Love: Essential Collection were instead included on the CD single A World to Believe In: Himiko Fantasia, released in Japan at the same time.

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