Gyakuyunyū: Kōwankyoku (逆輸入～港湾局～^?, "Reimport: Ports and Harbours Bureau") is an album by Japanese musician Ringo Sheena, released on May 27, 2014. It is a self-cover album, featuring new recordings of songs that Sheena wrote for other artists. Each song also collaborates with a different famous Japanese music producer. Gyakuyunyū was the final release of Sheena's 15th anniversary celebrations, released on the day marking 16 years since her debut single "Kōfukuron".

The title is a reference to grey market goods such as grey import vehicles. Gyakuyunyū (逆輸入^?, literally "reverse import", commonly shortened to "reimport") is a term used on such scenes.

The album had been a planned release by Sheena for several years, at least as far back as 2010 and 2011, when she was recording music with Chiaki Kuriyama.Gyakuyunyū: Kōwankyoku was released as a part of Ringo Sheena's 15th anniversary celebrations. This was after the single "Irohanihoheto/Kodoku no Akatsuki" and two albums released on November 13, 2013: Ukina, a collaboration compilation album and Mitsugetsu-shō, a live compilation album. Also released on November 13 were The Sexual Healing Total Care Course 120min. and Live, two box sets compiling all of her visual media. Several days after, Sheena held a series of concerts at the in Tokyo called Tōtaikai: Heisei Nijūgo-nen Kaneyama-chō Taikai (党大会平成二十五年神山町大会^?, "The Party Convention: 2013 Kamiyama Event") on November 18, 19, 20, 25 and 26. Two additional concerts for Sheena's fanclub called Hantaikai: Heisei Nijūgo-nen Hamarikyū Taikai (班大会平成二十五年浜離宮大会^?, "The Squad Convention: 2013 Hamarikyū Event") were held on November 28 and 29 at the Hamarikyu Asahi Hall in Tokyo. The November 26 concert was later released on DVD on March 19, 2014.

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