The So Crazy Tour was the fifth concert tour by Japanese recording artist Namie Amuro in support of her studio album, Style (2003). The tour began on November 29, 2003 at the Nagarakawa International Convention Center in Gifu, Japan and ended on May 15, 2004, at the Olympic Gymnastics Arena in Seoul, South Korea. It marked the first time that Amuro embarked on an international tour, and her first and only time to tour South Korea.

The So Crazy Tour was Amuro's first international tour. In addition to 34 dates in Japan, she made her first-ever solo tour dates in Taiwan, which became a regular stop for her later international tours, and South Korea, her only visit to the country. The international concerts were broadcast in their respective countries on national television, in which Amuro closed out her concerts with "Never End" partially sung in their local languages. The Taipei concerts were promoted as "So Craazy in Taipei" and the Seoul concerts were promoted as "So Crazy Tour in Seoul 2004".

Media outlets reported that all of the concerts in Japan were sold-out immediately, therefore additional concerts were added.^[1] The concerts in South Korea saw varying levels of occupancy during the three-day concert: the first day only had around 50% of the 10,000 seats full, the second day was around 80% full, and the third day was almost sold-out.^[2] Rain joined Amuro during the last day of the concert.

A concert album titled Namie Amuro So Crazy Tour Featuring Best Singles 2003–2004 was released as Namie Amuro's fifth concert DVD on September 23, 2004. Filmed in January 2004 in Tokyo International Forum A, the DVD captured a tour to date, spanning seven months and three countries. It peaked at number two on the Oricon DVD chart and sold 71,000 copies.