December 2012
| Day | Date | Celebration | Rank | |
|---|---|---|---|---|
| Day | Date | Celebration | Rank | |
| Saturday | 1 | Weekday in Ordinary Time | ||
| Sunday | 2 | 1st Sunday of Advent | Week I | |
| Monday | 3 | St Francis Xavier, Priest | memorial | |
| Tuesday | 4 | Weekday of Advent, St John Damascene, Priest, Doctor of the Church |
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| Wednesday | 5 | Weekday of Advent | ||
| Thursday | 6 | Weekday of Advent, St Nicholas, Bishop |
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| Friday | 7 | St Ambrose, Bishop, Doctor of the Church | memorial | |
| Saturday | 8 | The Immaculate Conception of the Blessed Virgin Mary | solemnity | |
| Sunday | 9 | 2nd Sunday of Advent | Week II | |
| Monday | 10 | Weekday of Advent, St John Roberts, Priest, Martyr (in Wales) |
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| Tuesday | 11 | Weekday of Advent, St Damasus I, Pope |
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| Wednesday | 12 | Weekday of Advent, Our Lady of Guadalupe |
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| Thursday | 13 | St Lucy, Virgin, Martyr | memorial | |
| Friday | 14 | St John of the Cross, Priest, Doctor of the Church | memorial | |
| Saturday | 15 | Weekday of Advent | ||
| Sunday | 16 | 3rd Sunday of Advent | Week III | |
| Monday | 17 | Weekday of Advent | ||
| Tuesday | 18 | Weekday of Advent | ||
| Wednesday | 19 | Weekday of Advent | ||
| Thursday | 20 | Weekday of Advent | ||
| Friday | 21 | Weekday of Advent, St Peter Canisius, Priest, Doctor of the Church |
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| Saturday | 22 | Weekday of Advent | ||
| Sunday | 23 | 4th Sunday of Advent | Week IV | |
| Monday | 24 | Weekday of Advent | ||
| Tuesday | 25 | The Nativity of the Lord | solemnity | |
| Wednesday | 26 | St Stephen, the first Martyr | feast | |
| Thursday | 27 | St John, Apostle, Evangelist | feast | |
| Friday | 28 | The Holy Innocents, Martyrs | feast | |
| Saturday | 29 | 5th day of Christmas Octave, St Thomas à Becket, Bishop, Martyr |
feast (in England) | |
| Sunday | 30 | The Holy Family of Jesus, Mary and Joseph | ||
| Monday | 31 | 7th day of Christmas Octave, St Sylvester I, Pope |