1st January
- Kalends of January
- The Octave of the Nativity of Our Lord
- The Feast of the Circumcision of Our Lord
- The Feast of the Thirty Soldiers Martyred at Rome
- St. Alalbero of Liege (BL)
- St. Almachius
- St. Basil of Aix
- St. Beoc
- St. Boannus (BL)
- St. Clarus
- St. Concordus of Spoleto
- St. Connat
- St. Cuan
- Ss. Elvam and Mydwyn
- St. Eugendus
- St. Euphrosyne
- St. Fanchea
- St. Felix of Bourges
- St. Fulgentius of Ruspe
- St. Gregory Narian Zen the Elder
- St. Hugolinus of Gualdo (BL)
- St. Justin of Chieti
- St. Maelrhys
- St. Magnus
- St. Mochua
- St. Odilo of Cluny
- St. Telemachus
- St. William of Dijon
- St. Zdislava Berka (BL)
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2nd January
- The Feast of the Many Martyrs who Suffered in Rome
- Octave of the Feast of St. Stephen (Protomartyr)
- St. Abel
- St. Adelard of Corbie
- St. Airaldus
- St. Antheros
- Ss. Argeus, Narcissus and Marcellinus
- St. Aspasius of Auch
- St. Basil the Great
- St. Bentivoligo de Bonis
- St. Blidulf of Bobbio
- St. Clarus
- St. Concordius
- St. Gerard Cagnoli
- St. Isadore of Antioch
- St. Ilsadore of Nitria
- St. Macarius the Younger
- St. Martinian of Milan
- St. Munchin of Limerick
- St. Odilo
- St. Stephana Quinzani
- St. Vincencianus
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3rd January
- Octave of the Feast of St. John the Apostle
- St. Antherus
- St. Bertilia
- St. Florentius
- St. Genevieve
- St. Gordius
- St. Peter Balsam
- St. Theopemptus
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4th January
- Octave of the Feast of the Holy Innocents
- St. Angela of Foligno
- St. Ferreolus
- St. Gregory
- St. Oringa
- St. Pharaildis
- St. Rigobert
- St. Roger of Ellant
- St. Titus
- St. Thomas Plumtree
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5th January
- Nones of January
- Vigil of Epiphany
- St. Convoyon
- St. Edward the King
- St. Emiliana
- St. Gerlac
- St. Paula
- St. Severinus
- St. Simeon Stylites the Elder
- St. Syncletica
- St. Talida of Antinoe
- St. Telesphorus
- St. Thomas
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6th January
- The Feast of the Epiphany of Our Lord
- Twelfth Night
- Ss. Balthazar, Caspar, and Melchior
- St. Diman of Connor
- St. Edeyrn
- St. Eigrad
- St. Erminold of Prefenning
- St. Frederic of St. Vanne (BL)
- St. Gertrude van Oosten (BL)
- St. Guarinus
- St. Hywyn of Averdaron
- St. Macara (Macra)of Rhiems
- St. Melanius of Rennes
- St. Merinus
- St. Peter of Canterbury
- St. Peter Thomas
- St. Schottin
- St. Wiltrudis of Bergen
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7th January
- Translation of St. Frambaldus
- St. Aldericus (Aldric)
- St. Anastasius of Sens
- St. Brannock
- St. Canute Lavard
- St. Cedd
- St. Clerus of Antioch
- St. Crispin of Pavia
- St. Crispin II of Pavia
- St. Cronan Beg
- Bl. Edward Waterson
- St. Emilian of Saujon
- Ss. Felix and Januarius
- St. Isidore
- St. Isidore of Seville
- St. Julian of Cagliari
- St. Kanute of Sleswig
- St. Kentigerna
- St. Lucian of Antioch
- St. Nicetas of Remesiana
- St. Palladius of Embrun
- St. Pelagius Of Embrun
- St. Raymond of Peñafort
- St. Reinold
- St. Sanctinus of Senlis
- St. Tillo
- St. Valentine of Passau
- St. Vitalis of Savigny
- St. Wittikund
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8th January
- St. Albert of Cashel
- St. Appollinaris the Apologist
- St. Atticus of Constantinople
- St. Baldwin
- St. Erhard of Regensburg
- St. Eugene
- St. Frodobert
- St. Garibaldus
- St. Gudula
- St. Lucian
- St. Natalanus
- St. Patiens of Metz
- St. Pega
- St. Rigobert of Reims
- St. Severinus
- St. Severinus of Septempeda
- St. William of York
- St. Wulsin of Sherbourne
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9th January
- Translation of St. Jodocus
- St. Adrian of Canterbury
- St. Brihtwald of Canterbury
- St. Felan
- St. Foelanus
- St. Honorius
- Ss. Julian and Basilissa
- St. Lucianus
- St. Pauline Marie Jaricot
- St. Marciana
- St. Paschasia
- St. Peter of Sebaste
- St. Waningus
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10th January
- St. Agatho
- St. Gregory X
- St. John Camillus Bonus
- St. Marcian
- St. Nicanor
- St. Paul the first hermit
- St. Peter Urseolus
- St. Petronius of Avignon
- St. Polieuctus
- St. Sethrida
- St. Thomian of Armagh
- St. Valeric
- St. William of Bourges
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11th January
- Feast of the death of three Kings
- St. Alexander of Fermo
- St. Anastasius of Castel Sant'Elia
- St. Beandan
- St. Bitalis of Gaza
- St. Boadin
- St. Brettiva
- St. Ergwin
- Ss. Ethenea and Fidelmia
- St. Honorata of Pavia
- St. Hyginus
- St. Leucius of Brindisi
- St. Palaemon
- St. Paulinus of Auqileia
- Ss. Paldo, Tsao, and Tato
- Ss. Peter, Severus, and Leucius
- St. Quintinus
- St. Salvius of Amiens
- St. Theodesius the Cenobiarch
- St. Vitalis of Gaza
- St. William of Bourges
- St. William Carter
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12th January
- The Feast of the Fourty-Two Martyrs of Ephesus
- St. Aelred
- St. Arcadius of Mauretania
- St. Benedict Bsicop
- St. Caesaria of Arles
- St. Elian ap Erbin
- St. Hilary of Poitiers
- St. John of Ravenna
- St. Martin of Loen
- St. Probus of Verona
- St. Remigius
- St. Satyrus
- St. Tatiana of Roma
- Ss. Tigrius and Eutropius
- St. Victorian(us) of Asan
- Ss. Zoticus, Rogatus, Modestus, Castulus, and Companions
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13th January
- Octave of Epiphany
- The Feast of the Fourty Soldiers martyred in Rome
- St. Agricius of Treves
- St. Andrew of Treves
- St. Berno of Cluny
- St. Elian
- St. Erbin
- St. Firminus of Amiens
- St. Glaphya
- St. Godfrey
- St. Hilary of Poitiers
- St. Ivetta
- St. Kentigern of Glasgow
- St. Potitus
- St. Remigius of Reims
- St. Veronica of Milan
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14th January
- St. Barbashemin and Companions
- St. Datius of Milan
- St. Felix of Nola
- St. Hilary
- St. Kentigern
- St. Macrina the Elder
- St. Odo of Novaria
- St. Pontianus
- St. Sabas of Servia
- Martyrs of Mt. Sinai and Raithu
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15th January
- Ides of January
- Translation of St. Maurilius
- St. Alexander Akimetes
- St. Bonitus of Auvergne
- St. Ceolwulf
- St. Emebert
- St. Ephysius
- St. Isadore
- St. Isidore of Seville
- St. Ita
- St. John Calybites
- St. Macarius
- St. Malard of Chartres
- St. Maurus
- St. Paul the Hermit
- St. Peter of Castelnau
- St. Remedius
- St. Sawl
- St. Secunda
- St. Tarscia (Tarsitia) of Rodez
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16th January
- Ss. Berardus, Peter, Otto, Accursius and Adjutus (five Friars Minor)
- St. Conrad of Mondsee
- St. Dacian and Companions
- St. Dunchaid O'Braoin
- St. Ferreolus of Ecija
- St. Fulgentius of Lagny
- St. Furseus
- St. Gundisalvus (Gonsalvo) of Amaranthia
- St. Henry
- St. Honoratus of Arles
- St. Honoratus of Fondi
- St. James of Tarentaise
- St. Jane of Bagno
- St. Karentoc
- St. Macarius the Elder
- St. Marcellus
- St. Melas
- St. Priscilla
- St. Tarantaise
- St. Tatian and Companions
- St. Triverius
- St. Valerius of Sorrento
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17th January
- Dies Aegypticae
- Ss. Achillas and Amoes
- St. Anthony
- Ss. Anthony, Merulus, and John
- Ss. Genelfus and Genitus
- St. Joseph of Freising (BL)
- St. Julian Sabas the Elder
- St. Myldgytha
- St. Nennius
- St. Pior
- St. Richimirus
- St. Rosaline de Villenueve (BL)
- St. Sabinas
- Ss. Speusippus, Eleusippius, Melesippius and Leonilla
- St. Sulpicius
- St. Sulpitius II Pius
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18th January
- The Feast of St. Peter's Chair
- St. Christina Ciccarelli
- St. Deicolus
- St. Lobard
- St. Prisca
- St. Ufrid
- St. Veneradnus of Auvergne
- St. Volusianus of Tours
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19th January
- St. Andrew of Peschiera
- St. Bassianus
- St. Branvalator
- St. Bernard of Corleone
- St. Desiderius
- St. Germanicus
- St. Henry
- St. Kanute
- St. Launomar
- St. Marius, Martha and sons (Audifax and Abachum)
- St. Nathalan
- St. Patroclus
- St. Pontianus
- St. Remigius of Rouen
- St. Thomas of Cori
- St. Wulstan
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20th January
- St. Benedict Ricasoli
- St. Contestus
- St. Desiderius of Therouanne
- St. Euthymius
- Ss. Fabian and Sebastian
- St. Fechin
- St. Henry
- Ss. Mary and Martha
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21st January
- St. Agnes
- St. Edward Stransham
- St. Epiphanius of Pavia
- St. Fructuosus and Companions
- St. Inez de Beniganim
- St. Meginrad
- St. Nicholas Woodfen
- St. Patroclus
- St. Winnin
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22nd January
- St. Anastasius
- St. Blaesilla
- St. Brihtwold
- St. Dominic of Sora
- St. Epiphanius
- St. Ulphus
- St. Urban
- St. Vincent
- Ss. Vincent, Orontius and Victor
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23rd January
- St. Agilus
- St. Asclas
- St. Bernard of Vienne
- Ss. Clement of Ancyra and Agathangelus
- St. Emerentiana
- St. Eusebius
- St. Ildephonsus
- St. John the Almoner
- St. Lufthild
- St. Macarius
- St. Maimbod
- St. Margaret of Ravenna
- St. Raymond of Penafort
- St. Urban
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24th January
- Translation of St. Erik
- St. Artemius
- St. Autbert
- St. Babylas
- St. Cadoc
- St. Felician
- St. Frances of Sales
- St. Macedonius
- St. Macharius
- St. Marcolino of Forli
- St. Sabinius
- St. Timothy
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25th January
- Conversion of St. Paul
- St. Amarinus
- St. Apollo
- St. Artemas
- Ss. Juventinus and Maximinus
- St. Poppo
- St. Prejectus
- St. Publius
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26th January
- St. Alberic
- St. Conan
- St. Julian
- St. Marus
- St. Paula
- St. Polycarp of Smyrna
- Ss. Timothy and Titus
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27th January
- St. Angela Merci
- St. John Chrysostom
- St. John of Warneton
- St. Julian
- St. Lupus
- St. Marius
- St. Paula
- St. Vitalian
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28th January
- Octave of the feast of St. Agnes
- St. Anthony of Amendola
- St. Charlemagne
- St. Cyril
- St. Giles of Lorenzana
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29th January
- St. Anastasia
- St. Bathildis
- St. Constantius
- St. Gildas the Wise
- St. Julian
- St. Julian the Hospitaler
- St. Paula
- St. Sabina
- St. Sabinianus
- St. Serena
- St. Sulpicius Severus
- St. Valerius
- St. Voloc
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30th January
- St. Adelelmus
- St. Adelgundis
- St. Anatolius
- St. Anne, Mother of Mary
- St. Barsamja
- St. Bathhildis
- St. Flavian
- St. Glascian
- St. Hyacintha Mariscotti
- St. Martina
- St. Matthew
- St. Polycarp
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31th January
- Translation of Ss. Felix, Fortunatus and Achilleus
- St. Aedhan
- Ss. Cyrus and John
- St. Eusebius
- St. Gaudus
- St. Geminianus
- St. Hyacinthus
- St. Ignatius
- St. John Bosco
- St. Julius
- St. Lodivica Albertoni
- St. Marcella
- St. Mark the Evangelist
- St. Metrannus
- St. Modoc
- St. Paolo Gambara-Costa
- St. Patroclus
- St. Peter Nolasco
- St. Protus
- St. Sabina
- Ss. Thyrsus and Victor
- St. Torquatus
- St. Ulphina
- St. Veronus
- St. Vigilus
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