5x5 The Best Selection of 2002–2004 is the second compilation album of the Japanese boy band Arashi. As with the group's recent albums, two editions were released. The album contains all of the singles the band released from 2002 to 2004 as well as several album tracks. The regular edition contains a bonus track, while the limited edition contains a booklet and a DVD containing all of the music videos the group has released since 1999.

Arashi is a Japanese boy band consisting of five members formed under the Johnny & Associates talent agency. The members are Satoshi Ohno, Sho Sakurai, Masaki Aiba, Kazunari Ninomiya, and Jun Matsumoto. Arashi officially formed on September 15, 1999, in Honolulu, Hawaii, and made their debut CD on November 3, 1999. The group was initially signed to Pony Canyon and released one studio album and six singles—beginning with their 1999 eponymous debut single before moving to the Johnny's subsidiary label J Storm in 2001, which was initially set up for their succeeding releases. While their debut single sold close to a million copies, the group took a mixture of pop and alternate/contemporary approach to its music which attracted core followers, but subsequently faced commercially slow sales.