Roman Catholic priests who also work in nonreligious careers (such as teaching) may become members of a union or professional association. The United States Conference of Catholic Bishops is "an assembly of the hierarchy of bishops who jointly exercise pastoral functions on behalf of the Christian faithful of the United States and the U.S. Virgin Islands." The National Religious Vocation Conference, a membership organization for vocation ministers for religious congregations, promotes vocation awareness, invitation, and discernment to life as a priest or religious sister or brother.
- Active and Contemplative Religious Sisters and Brothers
- Archakas
- Buddhist Priests and Contemplatives
- Cantors
- Directors of Corporate Sponsorship
- Directors of Fund-Raising
- Directors of Volunteers
- Eastern Orthodox Priests
- Environmental Education Program Directors
- Environmental Lobbyists
- Fund-Raisers
- Grant Coordinators and Writers
- Historic Preservationists
- Imams
- Land Acquisition Professionals
- Land Trust or Preserve Managers
- Librarians
- Lobbyists
- Museum Attendants
- Museum Directors and Curators
- Museum Technicians
- Muslim Religious Scholars
- National Park Service Employees
- Nonprofit Social Service Directors
- Park Rangers
- Proposal Managers
- Protestant Ministers
- Public Interest Lawyers
- Public Opinion Researchers
- Public Relations Specialists
- Purohits
- Rabbis
- Social Workers
- Zoo and Aquarium Curators and Directors