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The following is a list of Holy Days of Obligation compiled by our archdiocesan Office of Worship. The designation of Holy Days of Obligation varies from country to country, and there are even variations within the U.S.
1. The Solemnity of the Blessed Virgin Mary, the Mother of God, January 1, is a day of obligation unless it falls on a Saturday or a Monday.
2. The Solemnity of the Assumption of Mary, August 15, is a day of obligation unless it falls on a Saturday or a Monday.
3. The Solemnity of All Saints, November 1, is a day of obligation unless it falls on a Saturday or a Monday.
4. Since it is the patronal feast of the United States, the Solemnity of the Immaculate Conception of Mary is always a day of obligation WHEN IT IS CELEBRATED ON DECEMBER 8. (When December 8 is a Sunday of Advent, the Solemnity of the Immaculate Conception is moved to Monday, December 9, but without the obligation.)
5. Christmas, December 25, is always a holy day of obligation.
(In most regions of the U.S. including Indiana, the Solemnity of the Ascension of the Lord is celebrated on the Seventh Sunday of Easter. In those few regions in which it is still celebrated on the previous Thursday, it is a day of obligation.)
Download the Notations on the Liturgical Calendar for the Archdiocese of Indianapolis for 2011 (PDF format)