A red-light district or pleasure district is a part of an urban area where a concentration of prostitution and sex industry, such as , , and , are found. In most cases, red-light districts are particularly associated with female street prostitution, though in some cities, these areas may coincide with spaces of male prostitution and gay venues. Areas in many big cities around the world have acquired an international reputation as red-light districts.
Author Paul Wellman suggests that this and other terms associated with the American Old West originated in Dodge City, Kansas, home to a well-known prostitution district during the 19th century, which included the Red Light House saloon. This has not been proven, but the Dodge City use was likely responsible for the term's pervasiveness. A widespread folk etymology claims that early railroad workers took red lanterns with them when they visited so their crew could find them in the event of an emergency. However, folklorist Barbara Mikkelson regards this as unfounded.
A commonly repeated, though likely spurious, folk etymology stems from sailors coming back from sea to Amsterdam (): Women working as prostitutes, deprived of proper hygiene and running fresh water, carrying red lanterns — with their color camouflaging boils, zits, inequalities in the face and on the skin — made clear they were available as women of pleasure.
One of the many terms used for a red-light district in Japanese is 赤線]], literally meaning "red-line". Japanese police drew a red line on maps to indicate the boundaries of legal red-light districts. In Japanese, the term 青線]], literally meaning "blue-line", also exists, indicating an illegal district.
In the United States during the 19th and early 20th centuries, the term "sporting district" became popular for legal red-light districts. Municipal governments typically defined such districts explicitly to contain and regulate prostitution.
Some red-light districts (such as those in The Hague) are under video surveillance. This can help counter illegal forms of prostitution (such as child prostitution), in these areas that do allow regular prostitution to occur.
[[File:Prostitution laws of the world2.svg|center|thumb|upright=2.5|Legality of prostitution
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