January 1, the solemnity of Mary, Mother of God;
Thursday of the Sixth Week of Easter (in 2009, May 21), 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.

Diocesan Mass times

Note that in many countries outside of the United States, Epiphany (Jan 6), St. Joseph (Mar 19), Corpus Christi (Thursday after Trinity Sunday), and Sts. Peter & Paul (29 June) are also Holy Days of Obligation.