C
| Cab drivers | Joseph, Fiacre |
| Cabinetmakers | Anne, Joseph, Vincent de Paul |
| Cagliari, Italy | Saturninus of Cagliari |
| Cake makers | Honoratus |
| California | Our Lady of the Wayside |
| Caltanissett, Sicily | Michael the Archangel |
| Cambridge University | Etheldreda |
| Canada | Anne (Mother of Mary), Joseph, The martyrs of North America |
| Cancer Patients | Michael Argemir |
| Cancer victims | Peregrine Laziosi |
| Candelada | Bernard of Valdeiglesias |
| Candle-makers | Ambrose |
| Canonists, canon lawyers | Raymond of Peñafort, Robert Bellarmine, Ivo of Kermartin |
| Canons Regular of the Order of the Holy Cross; Crosier Fathers; Crosier Order | Odilia |
| Capuchin-Franciscan Province of Mid-America | Conrad of Parzham |
| Carmelite schools | Albert of Sicily |
| Carnival workers, carnies | Julian the Hospitaller |
| Carpenters | Joseph, Thomas, Apostle |
| Carriage makers | Eligius (Eloi) |
| Cartagena, Spain | Modestus |
| Cartwrights; cart makers | Elijah |
| Carvers | Blaise, Olaf II |
| Cashel, Ireland | Albert of Cashel |
| Castelabbate Italy | Constabilis of Cava |
| Catalonia | George |
| Catania | Agatha |
| Catechists | Viator, Charles Borromeo, Robert Bellarmine |
| Catechumens | Charles Borromeo, Robert Bellarmine |
| Cathedral-chapter of Langres | Gebuinus |
| Catholic Action | Francis of Assisi, Paul, Apostle |
| Catholic Action (in Italy) | Paul, Apostle, Gabriel Possenti |
| Catholic Charities | Vincent de Paul, Elizabeth of Hungary |
| Catholic press | Anthony Mary Claret, Francis de Sales |
| Catholic schools, Catholic academies | Thomas Aquinas, Ursula |
| Catholic Writters | Francis de Sales |
| Catholic Youth | Aloysius Gonzaga |
| Cats | Gertrude of Nivelles |
| Cattaro, Dalmatia | Trifone |
| Cattle | Bridgid of Ireland, Colman of Stockerau, Drogo, Perpetua, Roch |
| Cattle breeders | Mark |
| Cavalry | Martin of Tours |
| Cavalry, Italian | George |
| Cebu, Philippines | El Niño |
| Cemetery keepers, or caretakers | Joseph of Arimathea |
| Cemetery workers | Antony the Abbot, Callistus I |
| Central Africa | Therese of Lisieux |
| Central America | Our Lady of Loreto, Rose of Lima |
| Central and South America | Our Lady of Guadalupe, Rose of Lima |
| Champions; invincible people; to be invincible | Drausinus |
| Chaplains, military | John of Capistrano |
| Chaplains, military, Argentinian | Our Lady of Lujan |
| Chaplains, military, Australian | Our Lady Help of Christians |
| Chaplains, military, Belgian | Mary, Mediatrix of All Graces |
| Chaplains, military, Philippine | Immaculate Conception of Mary |
| Chaplains, military, Spanish | Immaculate Conception of Mary |
| Charcoal-burners | Alexander the charcoal-burner |
| Charitable societies | Vincent de Paul |
| Chastity, invoked for | Agnes of Rome, Thomas Aquinas |
| Chemical industry, chemical manufacturers | Cosmas and Damian |
| Chemists (pharmacists) | Cosmas and Damian |
| Chilblain | Basilissa |
| Child abuse victims | Alodia, Germaine Cousin, Lufthild, Nunilo |
| Childbirth | Gerard Majella, Margaret (or Marina) of Antioch, Raymond Nonnatus, Leonard of Noblac, Erasmus (Elmo) |
| Childhood diseases | Aldegundis, Pharaildis |
| Childhood intestinal diseases | Erasmus (Elmo) |
| Childless people | Anne Line, Catherine of Genoa, Gummarus, Henry II, Julian the Hospitaller |
| Childless women | Anne (Mother of Mary) |
| Children | Nicholas of Myra, Raymond Nonnatus, Nicholas of Tolentino |
| Children learning to speak or talk | Zeno of Verona |
| Children learning to walk | Zeno of Verona |
| Children of Mary | Agnes, Maria Goretti |
| Children who are late in learning to walk | Vaast |
| Children's choir | Dominic Savio, Holy Innocents |
| Children's nurses | Foillan |
| Children, desire for | Rita of Cascia |
| Children, illegitimate | John Francis Regis |
| Children, sick | Beuno, Clement I, Hugh of Lincoln, Ubald Baldassini |
| Chile | Our Lady of Mt. Carmel, James the Greater |
| Chilean army | Our Lady of Mt. Carmel |
| Chilean navy | Our Lady of Mt. Carmel |
| Chimney sweeps | Florian |
| China | Mary, Queen of China |
| Chivalry | George |
| Choir boys | Dominic Savio, Gregory the Great, Holy Innocents |
| Choirboys, choirs | Dominic Savio |
| Cholera | Roch |
| Christian Mothers | Anne (Mother of Mary) |
| Church | Joseph |
| Church cleaners | Theobald Roggeri |
| Church in North Africa | Ignatius of Antioch |
| Church in the eastern Mediterranean | Ignatius of Antioch |
| Cingoli, Italy | Sperandea |
| Circus workers | Julian the Hospitaller |
| Cistercian Order | Our Lady of the Assumption |
| City of Barbastro, Huesca. Aragón. España | Raymond of Barbastro |
| City of Chieti, Italy | Justin of Chieti |
| City of Cuenca, Spain | Julian of Cuenca |
| City of Saint-Oyen, Tarentaise, France | Eugendus |
| City of Saint-Oyen, Valley of Aoste, Italy | Eugendus |
| City of Saint-Oyens, Vaud, Switzerland | Eugendus |
| City of Salzburg, Austria | Rupert, Virgilius |
| City of Sutri, Italy | Dulcissima |
| Civil disorder, riot (against) | Andrew Corsini |
| Civil Servants | Thomas More |
| Clergy | Gabriel Possenti |
| Clergy, Diocesan | John of Avila |
| Clergy, Parochial | John Vianney |
| Clerics | Gabriel of Our Lady of Sorrows |
| Clermont (formerly Averna), France | Illidius |
| Clock makers; watch makers | Eligius (Eloi), Peter the Apostle |
| Clothing industry | Paul the Hermit |
| Clothworkers | Homobonus |
| Clowns | Genesius, Justin Martyr |
| Cloyne, Ireland | Colman of Cloyne |
| Coachmen | Richard of Chichester |
| Coal miners | Leonard of Noblac |
| Cobblers | Crispin and Crispinian |
| Coffee house owners or keepers | Drogo, Nativity of the Blessed Virgin |
| Coffin makers; casket makers | Stephen the Martyr |
| Coffin-bearers | Joseph of Arimathea |
| Coin collectors | Eligius (Eloi) |
| Colegio Capranica Seminary of Rome | Agnes of Rome |
| Colic | Erasmus (Elmo) |
| Colleges | Thomas Aquinas |
| Colombia | Peter Claver, Louis Betrand, Our Lady of Chiquinquira |
| Colorado | Immaculate Mary, Francis of Assisi |
| Comedians | Vitus |
| Commissariat, French Army | Ambrose |
| Commissariat, Spanish military | Teresa of Avila |
| Communication Workers | Gabriel the Archangel |
| Communism, opposition to | Joseph |
| Composers | Cecilia |
| Compositors; typesetters | John the Apostle |
| Computers, Computer users, Computer technicians, pc technicians | Isidore of Seville |
| Condemned criminals | Dismas |
| Confectioners | Honorius of Amiens, Joseph, Lawrence, Macarius the Younger |
| Confessions, to make a good one | Gerard Majella, John Nepomucene |
| Confessors | Alphonsus de Liguori, John Nepomucene |
| Congo; Zaire; Belgian Congo | Immaculate Conception of Mary, Our Lady, Queen of Nations |
| Connecticut | Notre Dame of Easton |
| Conscientious objectors | Marcellus |
| Construction workers | Thomas, Apostle |
| Contagious diseases | Robert Bellarmine, Sebastian |
| Contemplatives, Contemplative life | John of the Cross, Mary Magdalene |
| Converts | Afra, Alban, Anne Line, Boniface of Tarsus, Caedwalla, Charles Lwanga, Edwin, Flora of Cordoba, Genesius, Helena |
| Convulsions | John the Baptist, Willibrord |
| Convulsive children | Guy of Anderlecht, John the Baptist, Scholastica |
| Conze (Conza), Italy | Herbert Hoscam |
| Cooks | Martha |
| Cooks, chefs | Lawrence, Macarius the Younger, Martha, Nativity of the Blessed Virgin, Paschal Baylon |
| Coopers | Abdon and Sennen |
| Coppersmiths | Benedict, Eulogius of Cordoba, Leonard of Noblac, Maurus |
| Cordoba, Spain | Acisclus, Victoria |
| Corfu (Kerkira) Island, Greece | Arsenius of Corfu, Spyridon |
| Cork, Ireland | Finbar |
| Corleone, Sicily | Leolucas |
| Corn chandlers | Honorius of Amiens |
| Cornwall, England | Michael the Archangel, Petroc, Piran |
| Corsica | Alexander Sauli, Devota, Julia of Corsica, Our Lady of the Immaculate Conception |
| Costa Rica | Our Lady of the Angels, Our Lady of the Assumption |
| Coughs; against | Blaise, Quentin, Walburga |
| Council | Holy Spirit |
| Council of Vatican II | Joseph |
| Councilmen | Nicholas von Flue |
| Countesses | Elizabeth of Hungary |
| Counts | Charles the Good, Gerald of Aurillac |
| Court Clerks | Thomas More |
| Courtiers | Gummarus |
| Cowherds | Gummarus |
| Craftsmen and women | Dymphna |
| Craftsmen who work with a wheel (potters, spinners, etc.) | Catherine of Alexandria |
| Craftworkers | Luke |
| Cremona, Italy | Himerius |
| Crete | Titus |
| Criminals | Dominic |
| Croatian people | Joseph |
| Crops, protection of | Magnus of Fussen |
| Crusaders | Charles the Good, Louis IX |
| Cuba | La Virgen de la Caridad (Our Lady of Charity), Virgin de Regla |
| Cuby, Cornwall | Cybi |
| Curriers | Simon the Apostle |
| Cursillo movement | Paul, Apostle |
| Customs officers | Matthew |
| Cutlers | Lucy |
| Cutters | John the Baptist |
| Cyprus | Barnabas, Apostle |
| Czechoslovakia | Wenceslaus, Adalbert, John Nepomucene, Ludmila, Cyril and Methodius |