The name Friday comes from the Old English Frīġedæġ, meaning the «day of Frige«, a result of an old convention associating the Germanic goddess Frigg with the Roman goddess Venus, with whom the day is associated in many different cultures. The same holds for Frīatag in Old High GermanFreitag in Modern German, and vrijdag in Dutch.

In Christianity, Good Friday is the Friday before Easter. It commemorates the crucifixion of Jesus.

In Dravidian folk religion, special observances are practiced for mother goddesses on Friday. In Hinduism Fridays are important for married ladies of Hinduism. They worship God on that day.

In Islam, Friday (from sun-down Thursday to sun-down Friday, simpler than midnight to midnight in a pre-clock age) corresponds as a holy day to Sunday in Christianity and Saturday (Friday evening to Saturday evening) in Judaism and Sabbatarian Christianity.