In Roman Catholicism, Holy Days of Obligation are the days other than Sundays when Catholics are obligated to attend Mass. Below are the Holy Days of Obligation:
- December 8, the solemnity of the Immaculate Conception
- December 25, the solemnity of the Nativity of Our Lord Jesus Christ
- January 1, the Solemnity of Mary
- Thursday of the Sixth Week of Easter, the solemnity of the Ascension
- August 15, the solemnity of the Assumption of the Blessed Virgin Mary
- November 1, the solemnity of All Saints
