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1 (EIGHTH DAY OF CHRISTMAS)
- Holy Name of Jesus
- World Day of Peace
2 (NINTH DAY OF CHRISTMAS)
- Johann Konrad Wilhelm Loehe, Bavarian Lutheran Minister, and Coordinator of Domestic and Foreign Missions
- Narcissus, Argeus, and Marcellinus of Tomi, Roman Martyrs, 320
- Odilo of Cluny, Roman Catholic Abbot
- Sabine Baring-Gould, Anglican Priest and Hymn Writer
3 (TENTH DAY OF CHRISTMAS)
- Edward Caswall, Roman Catholic Priest and Hymn Writer
- Edward Perronet, British Methodist Preacher
- Gladys Aylward, Missionary in China and Taiwan
- William Alfred Passavant, Sr., U.S. Lutheran Minister, Humanitarian, and Evangelist
4 (ELEVENTH DAY OF CHRISTMAS)
- Elizabeth Ann Seton, Foundress of the American Sisters of Charity
- Felix Manz, First Anabaptist Martyr, 1527
- Gregory of Langres, Terticus of Langres, Gallus of Clermont, Gregory of Tours, Avitus I of Clermont, Magnericus of Trier, and Gaugericus, Roman Catholic Bishops
- Johann Ludwig Freydt, German Moravian Composer and Educator
5 (TWELFTH DAY OF CHRISTMAS)
- Antonio Lotti, Roman Catholic Musician and Composer
- Genoveva Torres Morales, Foundress of the Congregation of the Sacred Heart of Jesus and the Holy Angels
- John Nepomucene Neumann, Roman Catholic Bishop of Philadelphia
- Margaret Mackay, Scottish Hymn Writer
6 (EPIPHANY OF OUR LORD JESUS CHRIST)
7 (François Fénelon, Roman Catholic Archbishop of Cambrai)
- Aldric of Le Mans, Roman Catholic Bishop
- Angela of Foligno, Penitent and Humanitarian
- Gaspar del Bufalo, Founder of the Missionaries of the Precious Blood
- Lucian of Antioch, Roman Catholic Martyr, 312
8 (Thorfinn of Hamar, Roman Catholic Bishop)
- A. J. Muste, Dutch-American Minister, Labor Activist, and Pacifist
- Arcangelo Corelli, Roman Catholic Musician and Composer
- Nicolaus Copernicus and Galileo Galilei, Scientists
- Harriet Bedell, Episcopal Deaconess and Missionary
9 (Pepin of Landen, Itta of Metz, Their Relations, Amand, Austregisilus, and Sulpicius II of Bourges, Faithful Christians Across Generational Lines)
- Emily Greene Balch, U.S. Quaker Sociologist, Economist, and Peace Activist
- Julia Chester Emery, Upholder of Missions
- Philip II of Moscow, Metropolitan of Moscow and All Russia, and Martyr, 1569
- William Jones, Anglican Priest and Musician
10 (John the Good, Roman Catholic Bishop of Milan)
- Allen William Chatfield, Anglican Priest, Hymn Writer, and Translator
- Ignatius Spencer, Anglican then Roman Catholic Priest and Apostle of Ecumenical Prayer; mentor of Elizabeth Prout, Foundress of the Sisters of the Cross and Passion
- Mary Lundie Duncan, Scottish Presbyterian Hymn Writer
- William Gay Ballantine, U.S. Congregationalist Minister, Educator, Scholar, Poet, and Hymn Writer
11 (Theodosius the Cenobiarch, Roman Catholic Monk)
- Charles William Everest, Episcopal Priest, Poet, and Hymn Writer
- Miep Gies, Righteous Gentile
- Paulinus II of Aquileia, Roman Catholic Patriarch of Aquileia
- Richard Frederick Littledale, Anglican Priest and Translator of Hymns
12 (Benedict Biscop, Roman Catholic Abbot of Wearmouth)
- Aelred of Hexham, Roman Catholic Abbot of Rievaulx
- Anthony Mary Pucci, Roman Catholic Priest
- Henry Alford, Anglican Priest, Biblical Scholar, Literary Translator, Hymn Writer, Hymn Translator, and Bible Translator
- Marguerite Bourgeoys, Foundress of the Sisters of Notre Dame
13 (Hilary of Poitiers, Roman Catholic Bishop of Poitiers, “Athanasius of the West;” and Hymn Writer; mentor of Martin of Tours, Roman Catholic Bishop of Tours)
- Christian Keimann, German Lutheran Hymn Writer
- George Fox, Founder of the Religious Society of Friends
- Mary Slessor, Scottish Presbyterian Missionary in West Africa
- Samuel Preiswerk, Swiss Reformed Minister and Hymn Writer
14 (Macrina the Elder, Her Family, and Gregory of Nazianzus the Younger)
- Caesarius of Arles, Roman Catholic Bishop; and Caesaria of Arles, Roman Catholic Abbess
- Eivind Josef Berggrav, Lutheran Bishop of Oslo, Hymn Translator, and Leader of the Norwegian Resistance During World War II
- Kristen Kvamme, Norwegian-American Hymn Writer and Translator
- Sava I, Founder of the Serbian Orthodox Church and First Archbishop of Serbs
15 (Martin Luther King, Jr., Civil Rights Leader and Martyr, 1968)
- Abby Kelley Foster and her husband, Stephen Symonds Foster, U.S. Quaker Abolitionists and Feminists
- Bertha Paulssen, German-American Seminary Professor, Psychologist, and Sociologist
- Gene M. Tucker, United Methodist Minister and Biblical Scholar
- John Cosin, Anglican Bishop of Durham
16 (Roberto de Noboli, Roman Catholic Missionary in India)
- Berard and His Companions, Roman Catholic Martyrs in Morocco, 1220
- Edmund Hamilton Sears, U.S. Unitarian Minister, Hymn Writer, and Biblical Scholar
- Gustave Weigel, U.S. Roman Catholic Priest and Ecumenist
- Richard Meux Benson, Anglican Priest and Cofounder of the Society of St. John the Evangelist; Charles Chapman Grafton, Episcopal Priest, Cofounder of the Society of St. John the Evangelist, and Bishop of Fond du Lac; and Charles Gore, Anglican Bishop of Worcester, Birmingham, and Oxford; Founder of the Community of the Resurrection; Theologian; and Advocate for Social Justice and World Peace
17 (Antony of Egypt, Roman Catholic Abbot and Father of Western Monasticism)
- James Woodrow, Southern Presbyterian Minister, Naturalist, and Alleged Heretic
- Pachomius the Great, Founder of Christian Communal Monasticism
- Rutherford Birchard Hayes, President of the United States of America
- Thomas A. Dooley, U.S. Roman Catholic Physician and Humanitarian
18-25 (WEEK OF PRAYER FOR CHRISTIAN UNITY)
18 (CONFESSION OF SAINT PETER, APOSTLE)
19 (Sargent Shriver and Eunice Kennedy Shriver, Humanitarians)
- Deicola and Gall, Roman Catholic Monks; and Othmar, Roman Catholic Abbot at Saint Gallen
- Elmer G. Homrighausen, U.S. Presbyterian Minister, Biblical Scholar, and Professor of Christian Education
- Harold A. Bosley, United Methodist Minister and Biblical Scholar
- Henry Twells, Anglican Priest and Hymn Writer
20 (Fabian, Bishop of Rome, and Martyr, 250)
- Euthymius the Great and Theoctistus, Roman Catholic Abbots
- Greville Phillimore, English Priest, Hymn Writer, and Hymn Translator
- Harriet Auber, Anglican Hymn Writer
- Richard Rolle, English Roman Catholic Spiritual Writer
21 (Mirocles of Milan and Epiphanius of Pavia, Roman Catholic Bishops)
- Alban Roe and Thomas Reynolds, Roman Catholic Priests and Martyrs, 1642
- Edgar J. Goodspeed, U.S. Baptist Biblical Scholar and Translator
- John Yi Yon-on, Roman Catholic Catechist and Martyr in Korea
- W. Sibley Towner, U.S. Presbyterian Minister and Biblical Scholar
22 (John Julian, Anglican Priest, Hymn Writer, and Hymnologist)
- Alexander Men, Russian Orthodox Priest and Martyr, 1990
- Ladislao Batthány-Strattmann, Austro-Hungarian Roman Catholic Physician and Philanthropist
- Louise Cecilia Fleming, African-American Baptist Missionary and Physician
- Vincent Pallotti, Founder of the Society for the Catholic Apostolate, the Union of Catholic Apostolate, and the Sisters of the Catholic Apostolate
23 (John the Almsgiver, Patriarch of Alexandria)
- Charles Kingsley, Anglican Priest, Novelist, and Hymn Writer
- Edward Grubb, English Quaker Author, Social Reformer, and Hymn Writer
- James D. Smart, Canadian Presbyterian Minister and Biblical Scholar
- Phillips Brooks, Episcopal Bishop of Massachusetts, and Hymn Writer
24 (Ordination of Florence Li-Tim-Oi, First Female Priest in the Anglican Communion)
- George A. Buttrick, Anglo-American Presbyterian Minister and Biblical Scholar; and his son, David G. Buttrick, U.S. Presbyterian then United Church of Christ Minister, Theologian, and Liturgist
- Marie Poussepin, Foundress of the Dominican Sisters of Charity of the Presentation of the Virgin
- Martyrs of Podlasie, 1874
- Suranus of Sora, Roman Catholic Abbot and Martyr, 580
25 (CONVERSION OF SAINT PAUL, APOSTLE)
26 (TIMOTHY, TITUS, AND SILAS, COWORKERS OF SAINT PAUL THE APOSTLE)
27 (Jerome, Paula of Rome, Eustochium, Blaesilla, Marcella, and Lea of Rome)
- Angela Merici, Foundress of the Company of Saint Ursula
- Carolina Santocanale, Foundress of the Capuchin Sisters of the Immaculate of Lourdes
- Caspar Neumann, German Lutheran Minister and Hymn Writer
- Pierre Batiffol, French Roman Catholic Priest, Historian, and Theologian
28 (Albert the Great and his pupil, Thomas Aquinas, Roman Catholic Theologians)
- Daniel J. Simundson, U.S. Lutheran Minister and Biblical Scholar
- Henry Augustine Collins, Anglican then Roman Catholic Priest and Hymn Writer
- Joseph Barnby, Anglican Church Musician and Composer
- Somerset Corry Lowry, Anglican Priest and Hymn Writer
29 (LYDIA, DORCAS, AND PHOEBE, COWORKERS OF SAINT PAUL THE APOSTLE)
30 (Lesslie Newbigin, English Reformed Missionary and Theologian)
- Bathildas, Queen of France
- Frederick Oakeley, Anglican then Roman Catholic Priest
- Genesius I of Clermont and Praejectus of Clermont, Roman Catholic Bishops; and Amarin, Roman Catholic Abbot
- Jacques Bunol, French Roman Catholic Priest and Martyr, 1945
31 (Charles Frederick Mackenzie, Anglican Bishop of Nyasaland, and Martyr, 1862)
- Anthony Bénézet, French-American Quaker Abolitionist
- Lanza del Vasto, Founder of the Community of the Ark
- Menno Simons, Mennonite Leader
- Mary Evelyn “Mev” Puleo, U.S. Roman Catholic Photojournalist and Advocate for Social Justice
Lowercase boldface on a date with two or more commemorations indicates a primary feast