Monochrome (stylized as MONOCHROME) is the fifth studio album by South Korean singer-songwriter Lee Hyori. It was released on May 21, 2013, by B2M Entertainment and distributed by CJ E&M Music. The album, which has an analogue sound and retro feel, departs from her previous style of music. It is her first full-length release after a three-year hiatus since H-Logic (2010).

Unlike her previous work, Lee collaborated with foreign composers such as Norwegian songwriting team Dsign Music, who previously composed Girls' Generation's "Tell Me Your Wish (Genie)" and "I Got a Boy". She also worked with blues musician Kim Tae-chun, and her then-boyfriend for the new record.Beenzino, a member of hip-hop duo , Bak Ji-yong from vocal trio Honey G, comedian Ahn Young-mi, and Lee's companion dog Soonshim participated on the album as featured artists.

Monochrome contains a total of sixteen tracks, including the lead single "Bad Girls", the self-composed hit "Miss Korea", and "Show Show Show", a cover of "No No No" originally performed by German pop trio Monrose. A special edition of the album, featuring a 156-page photo book and limited to 5,000 copies, was available for pre-order starting on May 9, 2013.

The album sold about 17,000 physical copies and 2.75 million digital tracks in 2013, making it the 79th best-selling Korean album of that year. Lee bounced back as a musician thanks to the album's success, winning the award for Best Female Artist at 2013 Mnet Asian Music Awards.

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