In the Roman Catholic Church, the Holy Days of Obligation are the days, other than Sundays, on which the faithful are required to attend Mass. The 1983 Code of Canon Law standardized ten days to be observed as Holy Days of Obligation throughout the Church. These days are:

The conference of bishops in a particular country or region may suppress the observance of these days, or transfer it to another day, with the permission of the Vatican. For example, in the United States, the feasts of St. Joseph and of St. Peter and St. Paul are not Holy Days of Obligation, and Corpus Christi and the Epiphany are observed on the nearest Sunday.

See also