K
- Georg Joseph Kamel Czech botanist assigned to the Philippines; the Camellia flower was named after him
- Sebastian Kappen, Indian theologian
- Eusebio Francisco Kino, missionary and cartographer of Mexico and Arizona
- Athanasius Kircher, 17th-century German scientist; discoverer of microbes
- Saint James Kisai, Japanese martyr
- Adam Adamandy Kochański, Polish mathematician and clockmaker
- Anthony Kohlmann, early Catholic priest in New York whose decision not to testify established American precedent for "priest-penitent privilege" or "clergy confidentiality" in law
- Peter Hans Kolvenbach, linguist; 29th Superior General of the Society of Jesus
- Cardinal Ján Chryzostom Korec, Prisoner for Christ
- Saint Stanislaus Kostka, patron saint of Jesuit novices
- Franz Xaver Kugler, Doctor of chemistry and mathematics. Famous also for his Babylonian studies
- Kurien Kunnumpuram, Indian theologian (ecclesiology)
- Kai Smith, currently goes to (Loyola Academy)
Read more about this topic: List Of Jesuits