A red-light district is a part of an urban area where there is a concentration of prostitution and sex-oriented businesses, such as sex shops, strip clubs, adult theaters, etc. The term originates from the red lights that were used as signs of brothels.

The Red-Light district of Sonagachi in Kolkata is one of the largest in Asia.

There are areas in many big cities around the world which have acquired an international reputation as red-light districts.

Some red-light districts have acquired a touristic interest beyond sex tourism, and can be perceived as places of artistic, historic or cultural interest, whether or not they still serve the sex trade.

According to the Oxford English Dictionary, the earliest known appearance of the term "red light district" in print is in an 1894 article from The Sandusky Register, a newspaper in Sandusky, Ohio. 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 becoming pervasive. A widespread folk etymology claims that early railroad workers took red lanterns with them when they visited brothels so that their crew could find them in the event of an emergency. However, folklorist Barbara Mikkelson regards this as unfounded.

Red light may refer to:

Bunji Garlin July 14, 1978 is a Reggae Soca artist from Trinidad and Tobago. His real name is Ian Alvarez. He is of saint Lucian and Venezuelan descent. He married fellow Soca artist Fay-Ann Lyons on December 23, 2006, daughter of legendary Soca singer Superblue. He is also a second cousin of singer Patrice Roberts, who performs alongside the popular Machel Montano.

Bunji has won Trinidad's Soca Monarch competition on several occasions; 2002 (tied with Iwer George) with "Down in the Ghetto", 2004 with "Warrior Cry", 2005 with "Blaze the Fire" Both songs were produced by then band member Shawn Noel (Da Ma$tamind) and 2008 with "Fiery" He placed 2nd in the International Soca Monarch 2009 with Clear De Road, while his pregnant wife placed 1st with Meet Super Blue. She also won the Groovy Soca Monarch title that same night with Heavy T Bumpa.

Bunji Garlin's "Brrt" is featured on the Grand Theft Auto IV soundtrack.