| <-May 1966 | June 1966: | July 1966-> |
| Sunday: | Monday: | Tuesday: | Wednesday: | Thursday: | Friday: | Saturday: |
| 1: The 9th Wednesday in Ordinary Time | 2: The 9th Thursday in Ordinary Time | 3: The 9th Friday in Ordinary Time | 4: The 9th Saturday in Ordinary Time | 5: The Solemnity of the Holy Trinity | ||
| 6: The 10th Monday in Ordinary Time | 7: The 10th Tuesday in Ordinary Time | 8: The 10th Wednesday in Ordinary Time | 9: The 10th Thursday in Ordinary Time | 10: The 10th Friday in Ordinary Time | 11: The Memorial of Saint Barnabas, Apostle | 12: The Solemnity of Corpus Christi |
| 13: The 11th Monday in Ordinary Time | 14: The 11th Tuesday in Ordinary Time | 15: The 11th Wednesday in Ordinary Time | 16: The 11th Thursday in Ordinary Time | 17: The 11th Friday in Ordinary Time | 18: The 11th Saturday in Ordinary Time | 19: The Solemnity of the Sacred Heart of Jesus |
| 20: The 12th Monday in Ordinary Time | 21: The 12th Tuesday in Ordinary Time | 22: The 12th Wednesday in Ordinary Time | 23: The 12th Thursday in Ordinary Time | 24: The Birth of John the Baptist | 25: The 12th Saturday in Ordinary Time | 26: The 13th Sunday in Ordinary Time |
| 27: The 13th Monday in Ordinary Time | 28: The 13th Tuesday in Ordinary Time | 29: The Solemnity of Saints Peter and Paul, Apostles and Martyrs | 30: The 13th Thursday in Ordinary Time |