October 2021
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| 1 | Feast of St. Therese of the Child Jesus |
 | International Day of Older Persons |
| Respect All Life Month |
| 2 | Feast of the Guardian Angels |
| Birthday of Mahatma Gandhi (1869) |
| International Day of Nonviolence |
| 4 | Feast of St. Francis of Assisi (a favorite saint of Cornelia Connelly) |
| 6 | Feast of Blessed Marie Rose Durocher |
| 7 | Birthday of Archbishop Desmond Tutu (1931) |
| 10 | Birthday of Ken Saro–Wiwa (1941) a Nigerian writer, environmental activist and martyr. He was known for standing up against the Shell oil company to preserve his native homeland of the Ogoni people, an indigenous group in Nigeria. |
| World Mental Health Day |
| 11 | Feast of St. Pope John XXIII |
| Birthday of Eleanor Roosevelt (1884) |
| Birthday of Thích Nhat Hanh (1926) |
| 12 | Anniversary of the Death of Matthew Shepard (1976-1998) |
| 13 | Founding of the Society of the Holy Child Jesus by Cornelia Connelly, Derby, England, 1846 |
| 14 | International Day for National Disaster Reduction |
| 15 | Feast of St. Teresa of Avila |
| Anniversary of the First Mass celebrated in a Holy Child convent, 1846 |
| International Day of Rural Women |
| 16 | World Food Day |
| 17 | International Day for the Eradication of Poverty |
| 18 | Feast of St. Luke, Evangelist |
| 19 | Feast of Sts. John de Brebeuf and Isaac Jogues |
| Anniversary of the assassination of Digna Ochoa (1964-2001), a Mexican-human rights lawyer known for her work in defending the poor and those working to protect the environment. |
| 20 | Feast of St. Maria Bertilla Boscardí¬n—so devoted to her hospital patients that she remained with them through bombings and air raids during World War I. |
| 24 | Feast of St. Anthony Claret |
| United Nations Day |
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