Day of the Dead (Spanish: Día de Muertos) is a Mexican holiday observed throughout Mexico and around the world in other cultures. The holiday focuses on gatherings of family and friends to pray for and remember friends and family members who have died. It is particularly celebrated in Mexico where the day is a bank holiday. The celebration takes place on October 31, November 1 and November 2, in connection with the triduum of Allhallowtide: All Hallows' Eve, Hallowmas, and All Souls' Day. Traditions connected with the holiday include building private altars called ofrendas, honoring the deceased using sugar skulls, marigolds, and the favorite foods and beverages of the departed, and visiting graves with these as gifts. They also leave possessions of the deceased.

Scholars trace the origins of the modern Mexican holiday to indigenous observances dating back hundreds of years and to an Aztec festival dedicated to the goddess Mictecacihuatl. The holiday has spread throughout the world. In Brazil Dia de Finados is a public holiday that many Brazilians celebrate by visiting cemeteries and churches. In Spain there are festivals and parades and, at the end of the day, people gather at cemeteries and pray for their dead loved ones. Similar observances occur elsewhere in Europe, and similarly themed celebrations appear in many Asian and African cultures.