Shinju-ku is one of the 23 special wards of Tokyo, Japan. It is a major commercial and administrative center, housing the busiest train station in the world (Shinjuku Station) and the Tokyo Metropolitan Government Building, the administration center for the government of Tokyo. Shinju-ku has the highest numbers of registered foreign nationals of any community in Tokyo[citation needed]. As of October 1, 2005, 29,353 non-Japanese with 107 different nationalities were registered in Shinju-ku.

Golden Gai: An area of tiny shanty-style bars and clubs. Musicians, artists, actors and directors gather here, and the ramshackle walls of the bars are literally plastered with movie posters.

Kabukicho: A red-light district well-known for its bars, restaurants, and sex-related establishments.

Shinjuku Ni-chome: Tokyo's best-known gay district.

Takadanobaba and Waseda: The area between Waseda University, one of the most prestigious private universities in Japan, and Takadanobaba Station is a major residential and nightlife area for students.