Spell is the second extended play and the third album release by South Korean girl group DIA. It was released by MBK Entertainment on September 13, 2016.

On August 11, MBK Entertainment released teaser images for Mr. Potter which will be the title track of their new comeback album to-be released on September 12. The theme of the comeback is "Harry Poster" which will be produced by Shaun Kim. On August 30, MBK Entertainment announced that the album release date will be postponed to a day later and the new album will be released on September 13 instead.

From September 2 to September 3, DIA released teaser images for both the group and individual members. On September 2, a teaser video of the title track "Mr.Potter" was released. On September 6, DIA released individual teaser videos for "Mr.Potter". In addition, one of the songs included in the album Flower, Wind and You which is member Hui-hyeon's solo song will also feature vocals by IOI's Jeon Somi, Choi Yoojung and Kim Chungha. On September 9, DIA announced that they will be re-recording the fan song "The Love" after an online leak and will be released on September 14 with a new version. The full music videos for "Mr.Potter" and "The Love" were released on September 13 and September 14 at 12AM KST respectively.

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