 Saint Ciaran of Clonmacnoise Born:516? (County Roscommon, Ireland)Died:549.09.09 (Clonmacnoise, Ireland † 32)Abbot nullius of Clonmacnois (Ireland) (? – 549.09.09)Abbot. First abbot of Clonmacnoise. One of the Twelve Apostles of Ireland. |
 Blessed Ciprian, O.F.M. Dedë Nikaj (secular name) |
 Blessed Cipriano Alguacil Torredenaida, O.P. |
 Saint Cipriano di Calamizzi Born:1110 (Reggio Calabria, Italy)Died:1190.11.20 (Calamizzi, Italy † 79)Feast:11.20Abbot. Abbot of Monastery of San Nicola in Calamizzi. |
 Blessed Cipriano, O.C.S.O. Michael Iwene Tansi (secular name) |
| Blessed Cipriano José, F.M.S. Julián Iglesias Bañuelos (secular name) |
| Blessed Cipriano Polo García, O.E.S.A. |
| Saint Ciriaca di Roma |
| Saint Ciriaco |
| Saint Ciriaco di Buonvicino Abbot. Abbot of Santa Maria dei Padri near Trepidone. |
| Saint Ciriaco di Ostia |
| Blessed Ciriaco María Sancha y Hervás |
| Blessed Ciriaco Olarte Pérez de Mendiguren, C.SS.R. |
 Saint Ciriacus of Hierapolis Layperson. Companion of Saint Claudian of Hierapolis. Martyr. |
| Blessed Ciril Montaner Fabré, C.M.F. |
| Saint Cirilo Beltrán, F.S.C. José Sanz Tejedor (secular name) |
| Blessed Cirilo Pedro, F.S.C. Cecilio Manrique Arnáiz (secular name) |
| Saint Cirino |
| Saint Cisello di Sardegna |
 Saint Clair |
| Saint Clair du Dauphiné Abbot. Abbot of Saint-Marcel. |
| Blessed Claire de Saint-Rosalie, O.S.U. Marie-Claire du Bac (secular name) |
 Blessed Clara クララ (日本語) |
| Blessed Clara de Nuestra Señora de la Esperanza, C.C.V Clara Ezcurra Urrutia (secular name)Born:1896.08.17 (Mondragón, Guipúzcoa, Spain)Died:1936.11.24 🩸 (Picadero de Paterna, Valencia, Spain † 40)Beatified:2001.03.11Feast:11.24Religious of Carmelite Sisters of Charity Vedruna. Martyr. |
 Blessed Clara van het arme Kind Jezus, P.I.J. Clara Fey (secular name)Religious and founder of Sisters of the Poor Child Jesus. |
| Saint Clare of Assisi, O.S.C. Chiara OffreduccioReligious of Poor Clares. |
| Blessed Claude-Antoine-Raoul Laporte, S.J. |
| Blessed Claude-Barnabé Laurent de Mascloux |
| Blessed Claude Beguignot, O. Cart. |
| Blessed Claude Bochot, D.C. |
| Blessed Claude Cayx-Dumas, S.J. |
| Blessed Claude Chaudet |
| Blessed Claude Colin |
| Blessed Claude Dumonet Born:1747.02.02 (Prissé, Saône-et-Loire, France)Died:1794.09.13 🩸 (ship at Washington, Rochefort, France † 47)Beatified:1995.10.01Feast:09.13Priest of Autun. Martyr. |
| Blessed Claude Fontaine |
| Blessed Claude-François Gagnières des Granges, S.J. |
| Blessed Claude-Joseph Jouffret de Bonnefont, P.S.S. |
| Saint Claude La Colombière, S.J. |
| Blessed Claude Laplace Born:1725.11.15 (Bourbon-Lancy, Saône-et-Loire, France)Died:1794.09.14 🩸 (ship at Deux-Associés, Rochefort, France † 68)Beatified:1995.10.01Feast:09.14Priest of Moulins. Martyr. |
| Blessed Claude-Louis Marmotant de Savigny |
| Blessed Claude Ponse, C.R.S.V. |
| Blessed Claude Richard, O.S.B. |
| Blessed Claude Rousseau, P.S.S. |
| Blessed Claude-Silvain-Raphaël Mayneaud de Bizefranc |
| Saint Claudia of Ankara |
| Saint Claudian |
| Saint Claudian of Hierapolis Layperson. Companion of Saint Ciriacus of Hierapolis. Martyr. |
| Saint Claudianus |
| Saint Claudio |
| Blessed Claudio, O.F.M. Riccardo Granzotto (secular name) |
| Blessed Claudio José, F.S.C. Manuel Mateo Calvo (secular name) |
| Blessed Claudio Julián García San Roma, O.E.S.A. |
| Blessed Claudio López Martínez, C.M.F. |
| Blessed Claudio Pedro Gómez Gil Born:1883.01.28 (Hinojosa del Duque, Córdoba, Spain)Died:1936.09.04 🩸 (Hinojosa del Duque, Córdoba, Spain † 53)Beatified:2021.10.16 (Córdoba, Córdoba, Spain)Layperson of Córdoba. Married. Martyr. |
 Saint Claudius Layperson. Sculptor. One of the Four Crowned Martyrs. Martyr. |
 Saint Claudius |
| Saint Claudius |
| Saint Clelia Barbieri Religious and founder of Little Sisters of Our Lady of Sorrows. |
| Blessed Clelia Merloni, A.S.C.J. Religious and founder of Apostles of the Sacred Heart of Jesus. |
| Blessed Clemencia de San Juan Bautista, Sch.P. Antonia Riba Mestres (secular name)Born:1893.10.08 (Igualada, Barcelona, Spain)Died:1936.08.08 🩸 (El Saler, Valencia, Spain † 42)Beatified:2001.03.11Feast:08.08Religious of Daughters of Mary Escolapias. Martyr. |
 Blessed Clemens August von Galen |
| Blessed Clemens Kyūemon クレメンテ金右衛門 (日本語) |
| Blessed Clemens Ono クレメンテ大野 (日本語)Layperson of Nagasaki. Member of Confraternity of the Rosary. Martyr. |
| Blessed Clemente Adolfo, F.S.C. Clemente Vea Balaguer (secular name) |
| Blessed Clemente da Osimo, O.E.S.A. |
| Blessed Clemente de los Sagrados Corazones, O.C.D. Clemente López Yagüe (secular name) |
| Blessed Clemente Díez Sahagún, O.H. |
| Blessed Clemente Faustino, F.S.C. Herman José Fernández Sáenz (secular name) |
| Blessed Clemente Marchisio Born:1833.03.01 (Racconigi, Cuneo, Italy)Ordained Priest:1856.09.20Died:1903.12.16 (Rivalba, Torino, Italy † 70)Beatified:1984.09.30Feast:12.16Priest of Torino. Founder of Institute of the Daughters of St. Joseph. |
| Blessed Clemente Rodríguez Tejerina, O.M.I. |
 Blessed Clemente Vismara, P.I.M.E. |
| Saint Cleonicus of Amasea |
 Saint Cleopas Layperson. Disciple who encountered Jesus during the road to Emmaus. |
| Saint Cleto tiburtino Died:XI century (Tivoli, Italy)Deacon. |
| Saint Clinio, O.S.B. |
| Saint Clodoald, O.S.B. |
| Saint Clotilde |