Best 2 is a series of greatest hits compilation albums recorded by Ayumi Hamasaki which were released simultaneously on 28 February 2007 (2007-02-28). The artwork on the cover uses the singer's symbol, a heavily modified A, to stand for the name "Ayu" or "Ayumi Hamasaki", as was used in Best in 2001.

A Best 2: Black debuted at #1 in Japan on its first day and took #2 in the weekly chart as well as in several countries throughout Asia. It was ranked #4 on CDJapan's Top 100 album of 2007. A Best 2: White debuted at #1 in Japan and several countries throughout Asia. A Best 2: White was ranked #3 on CDJapan's Top 100 album of 2007.A Best 2: Black includes "dark" songs with "painful/heartbroken" lyrics while A Best 2: White is the opposite, containing "light" songs with "bright/cheerful/upbeat" lyrics.

Both sets were released in 1CD+2DVD versions with limited version covers for each album's color. The first DVD for each version includes all music videos for the songs off the album. The second DVD from A Best 2: White includes her latest Best of Countdown Live 2006-2007 A; the second DVD from A Best 2: Black includes a documentary which chronicles her concert Best of Countdown Live 2006-2007 A. Both albums feature songs released between the singles "Evolution" and "Heaven". No songs off her album Secret are featured on either album.

A special website was opened in order to promote A Best 2.

The tracks on A Best 2 were remastered in Los Angeles by Brian "Big Bass" Gardner, however they were not resung like the previous A Best.

A Best 2: Black includes a previously unreleased track, "Part of Me" (featured in a new Panasonic CM) and its accompanying music video. The song was certified gold for 100,000 legal downloads.

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