Friday (i/ˈfraɪdeɪ/ or /ˈfraɪdi/) is the day between Thursday and Saturday. In countries adopting Monday-first conventions as recommended by the international standard ISO 8601, it is the fifth day of the week. It is the sixth day in countries that adopt a Sunday-first convention as in Abrahamic tradition. (See "Numbered days of the week" for more on the different conventions.)

In many countries, Friday is the last day of a five-day working week, and is viewed as a cause for celebration or relief (leading to the phrase "TGIF", for "Thank God/Goodness It's Friday"). In some workplaces workers wear less formal attire on Fridays, known as Casual Friday or Dress-Down Friday. In other countries, (see workweek and weekend) Friday is the first day of the weekend, with Saturday the second. In Saudi Arabia, Afghanistan and Iran, Friday is the last day of the weekend, with Saturday as the first day of the working week. Bahrain, the United Arab Emirates (UAE) and Kuwait also followed this convention until they changed to a Friday–Saturday weekend, on 1 September 2006 in Bahrain and UAE,[1] and a year later in Kuwait.[2] In Iran, Friday is the only weekend day.