2025 Catholic Calendar Holy Days Of Obligation. In the catholic church, holy days of obligation are the days on which the faithful are obliged to participate in the mass. The catechism of the catholic church explains holy days of obligation this way:

Click on the link below to see the list of holy days of obligation and liturgical. Each year the secretariat of divine worship of the united states conference of catholic bishops publishes the liturgical calendar for the dioceses of the united.