Sherlock is the fourth EP of the South Korean boy group Shinee. The EP consists of seven tracks, including the title song "Sherlock (Clue + Note)", a hybrid remix of the two songs. It was released on March 21, 2012, in South Korea under the label S.M. Entertainment, and was distributed by KT Music. The album was made available online worldwide on March 19, 2012. The EP was Shinee's first Korean release after a year and 6 months hiatus.

The album was commercially successful in South Korea — the title track topped the Gaon Digital Chart, while the album charted at number one on the Gaon Album Chart with about 135,000 copies sold in the month of March, setting the record for most album sales in March 2012. It also placed 10th on the Billboard Weekly Heatseekers Albums and 5th on the Billboard Weekly World Albums charts.

Sherlock is Shinee's first Korean release after a year and 6 months hiatus since the reissue Hello in October 2010. The EP was physically released on March 21, 2012 but was made available online worldwide on March 19 through online music sites such as Melon and iTunes.

The choreography for the title song "Sherlock (Clue + Note)" is characterized by a unique and distinctive style, and is the work of the world-renowned choreographer Tony Testa.

The music video for the title song was released on March 22. It was directed by Cho Suhyun and shot in early March at the studios in Namyang-ju. Shinee can be see in an 1800s-like museum acting like detectives working on a case. Girls’ Generation's Jessica makes a special appearance in the music video as a mysterious female lead who offers a decisive clue in figuring out the incident. The music video exceeded one million views in a single day.

A Japanese version of "Sherlock (Clue + Note)", written by Natsumi Kobayashi, was included as one of the two tracks on their fourth Japanese CD single "Sherlock", which was released on May 16, 2012 with the Japanese original song "Keeping love again" as a B-side.

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