The list of Days of Obligation includes all Sundays. Some feasts, like Easter, are always celebrated on Sundays, so they are always obligatory. In addition to Sunday, the days to be observed as holy days of obligation in the Latin Rite dioceses of the United States of America are as follows:
January 1, the solemnity of Mary, Mother of God
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
December 8, the solemnity of the Immaculate Conception
December 25, the solemnity of the Nativity of Our Lord Jesus Christ
HOLY DAYS OF OBLIGATION 2026
Thu, January 1 - The Solemnity of Mary, Mother of God
Thu, May 14 - The Solemnity of the Ascension of the Lord
Sat, August 15 - The Solemnity of the Assumption of the Blessed Virgin Mary
Sun, November 1 - The Solemnity of All Saints
Tue, December 8 - The Solemnity of the Immaculate Conception of the Blessed Virgin Mary
Fri, December 25 - The Solemnity of the Nativity of Our Lord Jesus Christ