 Saint Kaleb of Axum |
 Blessed Kamen, A.A. Petăr Vichev (secular name)Петър Камен Вичев (български език) |
 Saint Karel van Sint Andries, C.P. Joannes Andreas Houben (secular name) |
 Blessed Karl Leisner |
 Blessed Karl, O.F.M. Ndue Serreqi (secular name) |
 Blessed Karolina Kózka |
| Blessed Kaspar Stanggassinger, C.SS.R. |
| Saint Kastor von Karden |
 Saint Kateri Tekakwitha |
 Saint Katharine Drexel Religious and founder of Congregation of the Sisters of the Blessed Sacrament for Indians and Coloured People. |
| Blessed Kazimierz Grelewski Born:1907.01.20 (Dwikozy, Świętokrzyskie, Poland)Ordained Priest:1929.08Died:1942.01.09 🩸 (KZ Dachau, Oberbayern, Germany † 34)Beatified:1999.06.13 (Warszawa, Poland)Feast:01.09Priest of Radom. Martyr. |
| Blessed Kazimierz Tomasz Sykulski Born:1882.12.29 (Końskie, Świętokrzyskie, Poland)Ordained Priest:1905.07.02Died:1942.12.11 🩸 (Auschwitz, Poland † 59)Beatified:1999.06.13 (Warszawa, Poland)Feast:12.01Priest of Radom. Martyr. |
| Blessed Kazimierz Witold Gostyński |
| Saint Kevin of Glendalough |
 Blessed Khodianin oğlu Kadir (Armenian Rite) |
| Saint Kieran Ciarán of Saigir |
| Saint Kilian |
| Saint Kinga Princess of Hungarian monarchy. |
 Saint Kizito |
 Saint Kjeld Born:1100? (Venning, Denmark)Died:1150.09.27 (Viborg, Denmark † 49)Canonised:1189.07.11Feast:07.11Bishop of Viborg (Denmark) (? – 1150.09.27 not possessed)Priest. Canon of Viborg. |
| Blessed Klara, SŁ.N.S.J. Ludwika Szczęsna (secular name)Religious and founder of Sister Servants of the Most Sacred Heart of Jesus. |
 Blessed Klemens, O.F.M. Obs. |
| Blessed Klemens, O.P. |
 Saint Klemens Maria Hofbauer, C.SS.R. |
 Blessed Klymentii, M.S.U. (Ukrainian Rite) Maria Kazymyr Sheptyts’kyi (secular name)Марiя Казимир Климентій Шептицький (Українська) |
| Saint Konrad von Bayern, O. Cist. |
| Saint Konrad von Konstanz |
| Saint Konrad von Parzham, O.F.M. Cap. |
| Blessed Konstanty Bojko (Ukrainian Rite) |
| Blessed Konstanty Łukaszuk (Ukrainian Rite) |
| Blessed Kouradji oğlu Tzeroum (Armenian Rite) |
| Saint Krystyn |
| Blessed Krystyn, O.F.M. Wojciech Gondek (secular name) |
| Blessed Krzysztof, O.P. |
 Blessed Kunjachan (Syro-Malabar Rite) Augustine Thevarparambil (secular name) |
| Saint Kuriakose Elias Chavara, C.M.I. (Syro-Malabar Rite) |
 Saint Kyneburgha Abbess. Sister of Saint Kyneswide. |
| Saint Kyneswide Abbess. Sister of Saint Kyneburgha. |
 Saint Kyrion of Alexandria |