Day of the Dead (Spanish: Día de Muertos) is a Mexican holiday celebrated throughout Mexico, in particular the Central and South regions, and by people of Mexican ancestry living in other places, especially the United States. It is acknowledged internationally in many other cultures. The multi-day holiday focuses on gatherings of family and friends to pray for and remember friends and family members who have died, and help support their spiritual journey. In 2008 the tradition was inscribed in the Representative List of the Intangible Cultural Heritage of Humanity by UNESCO.

The holiday is sometimes called Día de los Muertos in Anglophone countries, a back-translation of its original name, Día de Muertos. It is particularly celebrated in Mexico where the day is a public holiday. Prior to Spanish colonization in the 16th century, the celebration took place at the beginning of summer. Gradually it was associated with October 31, November 1 and November 2 to coincide with the Western Christian triduum of All hallowtide: All Saints' Eve, All Saints' Day, 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. Visitors also leave possessions of the deceased at the graves.