Kabukichō is an entertainment and red-light district in Shinjuku, Tokyo, Japan. Kabuki-chō is the location of many host and hostess clubs, love hotels, shops, restaurants, and nightclubs, and is often called the "Sleepless Town" (眠らない街, Nemuranai Machi, pronounced [nemɯɾanai matɕiꜜ]). Shinjuku Golden Gai, famous for its plethora of small bars, is part of Kabuki-cho. 

The district's name comes from late-1940s plans to build a kabuki theater; although the theater was never built, the name stuck. The area has many movie theaters, and is located near Shinjuku Station, Seibu Shinjuku Station, and several other major railway and subway stations. 

Originally, the area was known as Tsunohazu (角筈) and was a swamp. After the Meiji Period, the area became a duck sanctuary. As the Yodobashi Purification Plant was built in 1893, the ponds were filled in. In 1920, a girls' school was built there, and the surroundings were developed into a residential area. Prior to World War II, the district was one of the areas open to foreign-born property owners (primarily from Taiwan and Korea), who mainly operated tsurekomi yado, predecessors to today's love hotels.

Kabuki-chō was quickly redeveloped after the war, mainly due to the efforts of the overseas Chinese in Japan who bought land left unused after the expos and greatly developed them. The "three most renowned overseas Chinese of Kabukicho" include the founder of Humax, Lin Yi-wen, who started his business with a cabaret; Lin Tsai-wang, who built the Fūrin Kaikan; and Lee Ho-chu, owner of the Tokyo Hotel Chinese restaurant. In 2002, it was estimated that 70% of the land in Kabukichō was owned by foreign-born Japanese residents and their descendants. The rise of home video entertainment decreased the demand for live performances and film theaters, and Kabukichō became home to a number of video arcades, discos, and fuzoku.

By 1999, the area had been named "Asia's largest adult entertainment district", and tabloids were regularly running candid photographs of drunken Kabukichō patrons fighting and being arrested. However, starting in 2003, joint citizen and police patrols began enforcing business licensing and the 1948 Businesses Affecting Public Morals Regulation Act was more strictly enforced as well starting in April 2004, forcing adult-themed businesses to start removing customers at midnight in preparation to close by 1 AM. Kabukichō leaders attributed the change in enforcement to Tokyo Governor Shintaro Ishihara and the Tokyo bid for the 2016 Summer Olympics. 

Recently, tourism from China and Korea is on the rise, and so, many tourists can be seen in Kabukichō even during daytime. After several large hotels opened in the district, the Kabukicho Concierge Association was formed to recommend businesses that would be safe for foreign patrons, as the area is notorious for the practice known as bottakuri, where some businesses add exorbitant hidden fees to bring the final bill well beyond the initial advertised prices.

The Shinjuku Koma Theater was a landmark in Kabukichō. By 2008, it had moved to its third location; since it opened in 1956, it has hosted concerts and other performances by top stars, including enka singers Saburō Kitajima, Kiyoshi Hikawa, and actor Ken Matsudaira. The site was redeveloped and the Toho Shinjuku Building was completed there in 2014, including the 12-screen Toho Cinemas Shinjuku theatre and the Hotel Gracery Shinjuku. A "life-size" replica of Godzilla (from the neck up) was added to an outdoor terrace in 2015; it has since become a local landmark.