A (Ayumi Hamasaki EP)

A (stylized as ) is an extended play (EP) by Japanese recording artist Ayumi Hamasaki. It was released by Avex Trax in Japan and Hong Kong on August 11, 1999, in 10 different editions, and through Avex Entertainment Inc. worldwide in September 2008. It additionally served as a single from her second studio album Loveppears (1999), and is her first single marketed as an EP. The 12-track EP contains four new original songs: "Monochrome", "Too Late", "Trauma", and "End Roll", and eight remixes. All songs were written by Hamasaki, while production was handled by long-time collaborator Max Matsuura.

Musically, like Loveppears, A is a pop rock album with dance music influences. Lyrically, the new songs are written from a third-person perspective, and deal with themes such as nostalgia, anxiety, and trauma. Upon release, A received favorable reviews from music critics for its individual tracks—some of which were highlighted as examples of Hamasaki's best work—and as a collection, with additional praise for the production quality of the EP versions of the original songs over that of their parent album counterparts. Some criticism was directed towards the number of remixes present on the EP.

Commercially, the single peaked at number one in Japan, on the Oricon Singles Chart and TBS' Count Down TV chart. It became Hamasaki's second consecutive single to sell over one million copies domestically—it is also the singer's highest-selling single—and was certified Million by the Recording Industry Association of Japan (RIAJ) for shipments of one million units. Hamasaki did not film any music videos for the new songs, but appeared in several commercials broadcast in Japan that featured the new music. Each original song has subsequently been included on various greatest hits albums released by Hamasaki, including A Best (2001) and A Complete: All Singles (2008). "A" currently ranks as the 57th highest selling Japanese single of all time.