Dedicated to the Immaculate Heart of Mary
- August 1
- St. Peter in Chains
- The Holy Maccabees, Martyrs
- SS. Faith, Hope, and Charity, Martyrs
- St. Friard de Indret
- August 2
- Our Lady, Queen of the Angels
- Pope St. Stephen I, Martyr
- St. Alphonsus de Liguori
- August 3
- The Finding of St. Stephen’s Relics
- St. Peter Julian-Eymard, Founder
- St. Lydia of Thyatira
- August 4
- St. Dominic, Founder
- August 5
- Our Lady of the Snows
- August 6
- Feast of the Transfiguration of Our Lord, Jesus Christ
- Pope St. Sixtus II, Martyr
- SS. Felicissimus and Agapitus, Martyrs
- August 7
- St. Cajetan of Thiena, Founder
- St. Donatus, Bishop and Martyr
- August 8
- The Fourteen Holy Helpers (Auxiliary Saints)
- SS. Cyriacus (Auxiliary Saint), Largus, and Smaragdus, Martyrs
- St. John Marie Vianney, Confessor
- August 9
- Vigil of St. Lawrence, Martyr
- St. Romanus, Martyr
- August 10
- St. Lawrence, Martyr (Major Feast)
- St. Deusdidit
- August 11
- St. Philomena, Martyr
- August 12
- St. Clare of Assisi, Foundress and Virgin
- August 13
- The Dormition of the Blessed Virgin Mary
- The Appearance of the Blue Cloud in Fatima
- August 14
- Vigil of the Assumption
- August 15
- The Assumption of the Blessed Virgin Mary
- August 16
- St. Joachim, Father of the Blessed Virgin Mary
- St. Rocco (Roch)
- St. Beatrice
- August 17
- St. Hyacinth, Priest
- August 18
- St. Helena, Empress and Mother of Emperor Constantine
- St. Agapitus, Martyr (Auxiliary Saint)
- August 19
- Fourth Apparition of Our Lady of Fatima to the seers
- Pope St. Sixtus III
- St. John Eudes, Founder
- St. Louis, Bishop of Toulouse
- August 20
- St. Bernard of Clairvaux, Abbott
- August 21
- Our Lady of Knock
- St. Jane-Frances de Chantal, Foundress
- August 22
- The Immaculate Heart of the Blessed Virgin Mary
- St. Symphorian, Martyr
- August 23
- St. Philip Benizi, Servite Priest
- August 24
- St. Bartholomew the Apostle, Martyr
- St. Aurea, Virgin and Martyr
- St. Emily de Vlalar, Foundress
- August 25
- St. Louis IX, King of France
- August 26
- Our Lady of Czestochowa (Poland)
- Pope St. Zephyrinus, Martyr
- St. Anastasius the Fuller, Martyr under Diocletian
- August 27
- The Seven Joys of the Blessed Virgin Mary
- St. Joseph Calasanctius, Founder
- August 28
- St. Augustine of Hippo, Bishop and Doctor of the Church
- St. Hermes, Martyr
- August 29
- The Beheading of St. John the Baptist
- St. Sabina, Martyr
- August 30
- St. Rose of Lima, Mystic
- August 31
- St. Raymond Nonnatus
- St. Dominguito del Val, Young Martyr