Enciclopedia Católica
- Kafires
- Kaiserchronik
- Kajetan Georg von Kaiser
- Karl Ernst Jarcke
- Karl Josef Rudolph Cornely
- Karl von Haimhausen
- Kaspar Ulenberg
- Kasper, Walter (1933-
- Kaulen Franz Philip
- Keeler, William Henry (1931-
- Kenitas (o Quenitas)
- Kenosis
- khart, Meister Johann
- Kim Stephen Sou Hwan (1922-
- Kitbunchu, Michael Michai (1929-
- Konig, Franz (1905-
- Kor, S.J., Ján Chryzostom (1924-
- Kozlowiki, S.J., Adam (1911-
- Kuharic, Franjo (1919-
- Kulturkampf
- Kyrie Eleison