A ladies' night (sometimes ladies night) is a promotional event, often at a bar or nightclub, where female patrons get a reduced price for admission or goods.

Ladies' nights in the United States have been successfully challenged in lawsuits by men who were discriminated against by these events,Rowe, Chip (December 2003). Ladies Night R.I.P. Playboy and are illegal in some jurisdictions: in California they were ruled illegal under the Unruh Civil Rights Act, in Koire v Metro Car Wash, 40 Cal 3d24, 219 Cal Rptr 133 (1985).

In the early 1990s, Bud Light ran a series of ads in which several men dressed unconvincingly as women in an attempt to avoid the requirement to pay the establishment for the beer they consumed. Bud Light Ladies' Night ads via Commercial Closet

Ladies' night also may refer to a particular day of the week at a golf course or country club where only women are allowed to sign up for the event and allowed on the course.Fact: date=September 2008

In Singapore, there has been cases where females are not admitted under this scheme as they have been deemed as butches.

In the United Kingdom a ladies' night will often feature a male stripper or several.