"Best of KAT-TUN" is the debut album by Japanese boy band KAT-TUN, released in Japan on March 22, 2006 by J-One Records. Despite the title, it is not a greatest hits compilation album. Seven songs on the record, however, were part of KAT-TUN's live tour set list prior to their debut and were already familiar with longtime fans. The album was part of a tripartite release also consisting of the group's debut single and its tie-in DVD. All three releases were immensely successful on the Oricon albums, singles and DVD charts with "Real Face" and "Real Face Film" being certified as the best-selling single and domestic music DVD of the year respectively. The album itself was the eleventh best-selling album of the year.