Rainism is the fifth Korean-language studio album by South Korean recording artist Rain, released on October 15, 2008.

The album produced the singles "Love Story" and the title track "Rainism", the latter of which became one of Rain's signature songs.

Rainism sold over 131,000 copies in 2008 according to the South Korean Hanteo record chart, and was ranked as the fifth best-selling album of the year.

To support the album, Rain embarked on the Legend of Rainism Tour which spanned 14 shows across Asia and North America.

The tour began in Seoul and included stops in Japan, China, Singapore and Indonesia, for a total of 28 concerts in 9 countries.

[8] Paste named Rainism one of The 30 Greatest K-pop Albums of All Time,[9] while Rolling Stone ranked the single "Rainism" number 36 in their list of the 100 Greatest Songs in the History of Korean Pop Music, writing that it "cinched [Rain's] status as K-pop's most overtly sexy star" with its suggestive lyrics "over the top of a throbbing beat".