The Catenian Association
- International brotherhood of Catholic business and professional men. History, aims, directory of provinces, contact information. Online version of monthly magazine (in PDF). Site uses frames.
- http://thecatenianassociation.org/

Catholic Health Association of Canada
- Umbrella organization of health care facilities and associations witnesses to the healing ministry and abiding presence of Jesus. Site in English and French.
- http://www.chac.ca/

Catholic Medical Association
- Exists to uphold the principles of Catholic faith and morality as related to the science and practice of medicine.
- http://www.cathmed.org/

National Association of Catholic Chaplains
- Professional association for certified chaplains and CPE supervisors. Provides standards, certification, education, advocacy, and professional development.
- http://www.nacc.org/

Catholic Health Association of the United States
- National leadership organization of more than 1,200 Catholic health care sponsors, systems, facilities, and related organizations and services.
- http://www.chausa.org/