"Naisho no Hanashi" (ナイショの話) is a pop song by the Japanese duo and idol unit ClariS, written by Ryo. It was released as the unit's fourth single on February 1, 2012, by SME Records. The song was used as the ending theme to the 2012 anime series Nisemonogatari. A music video was produced for "Naisho no Hanashi", directed by Kazuaki Nakamura. The single peaked at No. 2 on Japan's weekly Oricon singles chart.

"Naisho no Hanashi" is a J-pop song with instrumentation from electric and bass guitars and drums. According to a book of sheet music published by Shinko Music Entertainment, it is set in common time and moves at a tempo of 194 beats per minute. Beginning in the A major key, the introduction starts with ClariS' vocals and adds drums and guitars to transition into the first verse followed by the chorus. After a short bridge, this pattern is repeated for the second verse and chorus featuring the same music with different lyrics. A break is used to transition into the chorus, immediately followed by another chorus as the outro in B-flat major. An instrumental coda is used to close the song.

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