August 1st
Feast of St. Alphonsus Liguori, Bishop (d. 1787)
St. Alphonsus Liguori from the Catholic Encyclopedia
August 2nd
Feast of St. Peter Julian Eymard, Priest (d. 1868)
August 3rd
Feast of St. Lydia (d. 1st Century, A.D.)
August 4th
Feast of St. John Vianney, Priest (d. 1859)
August 7th
Feast of St. Sixtus II and Companions, Martyrs (d. 258)
August 8th
Feast of St. Dominic de Guzman, founder of the Dominicans (d. 1221)
Resources: St. Dominic and the Rosary by Catherine Beebe (Vision Series)
August 9th
Feast of St. Romanus, Martyr (d. 258 A.D.)
Note: St. Romanus was a Roman soldier/prison guard who was converted by one of his prisoners - St. Lawrence - and was martyred the day before St. Lawrence was.
Feast of Saint Teresa Benedicta (Saint Edith Stein)
August 10th
Feast of St. Lawrence, Deacon and Martyr (d. 258 A.D.)
August 11th
Feast of St. Clare of Assisi Founder of the Poor Clares (d. 1253)
August 13th
Feast of St. John Berchmans (d. 1621)
August 14th
Feast of St. Maximillian Kolbe (d. 1941)
Resources: "The Volunteer at Auschwitz" by Chuck Colson, pp. 803-808 of The Book of Virtues edited by William Bennett.
August 15th
Assumption of the Blessed Virgin Mary into Heaven
August 16
St. Stephen (d. 1038)
August 17th
Feast of St. Hyacinth of Poland (d. 1257)
August 18th
Feast of St. Jane Francis de Chantal (d. 1641)
August 19th
Feast of St. John Eudes (d. 1680)
August 20th
Feast of St. Bernard of Clairvaux (d. 1153)
August 21st
Feast of Saint Pius X, Pope (d. 1914)
August 22nd
The Queenship of Mary
August 23rd
Feast of St. Rose of Lima (d. 1617)
August 24th
Feast of St. Bartholomew, Apostle and Martyr (d. 72 A.D.)
August 25th
Feast of St. Louis, King of France (d. 1270)
August 27th
Feast of St. Monica (d. 387), Mother of Saint Augustine
August 28th
Feast of St. Augustine, Bishop and Doctor of the Church (d. 430)
August 29th
Feast of the Martyrdom of St. John the Baptist
August 30th
Feast of St. Fiacre, Hermit, (d. 670)
August 31st
Feast of St. Raymond Nonnatus (d. 1240)