Rain's World is the fourth Korean-language studio album by South Korean recording artist Rain. It was released on October 14, 2006, through JYP Entertainment. Building on the success of its predecessor, the album further established him as one of the top musical acts in Southeast Asia. A repackaged edition of the album was released on December 22, 2006.

Jung Ji-hoon, better known by his stage name Rain or Bi Rain, is a South Korean singer, songwriter, dancer, actor, and record producer. Rain's musical career includes seven albums, 28 singles and numerous concert tours around the world. He achieved breakthrough success with his third Korean album, It's Raining (2004), which spawned the number one single of the same name. The album sold over 200,000 copies in South Korea and one million copies throughout Asia, and established Rain as an international star.