- American Cave Conservation Association
 - nonprofit organization formed for the purpose of protecting caves and karstlands. Site offers videos, photos, calendar, merchandise, and visitor information. - Boston Grotto
- Cave photos, instructions, and general caving information for the Boston Grotto, located in Cambridge, Massachusetts.
- Burnley Caving Club
- Official site of the Burnley Caving club located in Lancashire, U.K. Includes newsletter, membership information, meets list, and photo gallery.
- Carroll Cave Conservancy
- Dedicated to the conservation and perpetual protection of the Toronto Springs watershed including Carroll Cave.
- Cave Conservancy of the Virginias
- Dedicated to the preservation of topographical and biological environments in the Karst areas of Virginia and West Virginia.
- CAVEX
- Private nonprofit institution, that elaborates and manages extreme cave exploration projects. In Russian.
- Desert Caves Project, The
- Provides articles, travelogues, and photos about cave exploring in Saudi Arabia's Dahna Desert to inform people of the fragility and dangers of the underground caves.
- Grupo de Investigaciones Espeleológicas de Jerez
- La espeleología en Cádiz, España.
- Indiana Karst Conservancy
- Working to preserve Indiana's unique karst features. Site includes membership information, lists of caves in Indiana, and links.
- Jamaican Caves and Sinkholes
- Jamaican Caves Organization provides reports, caving activity, news, and guidance for cavers in Jamaica.
- Karst Conservancy, The
- A national land trust for karst protection headquartered in Florida. Site includes photos, definition of karst, hidden landscapes, and desktop wallpaper.
- Michigan Karst Conservancy
- Includes current projects, membership information, and more about the Michigan Karst Conservancy.
- Mid-Atlantic Karst Conservancy
- Dedicated to "preserving the caves of today for the cavers of tomorrow." Site includes event calendar, news, membership information, and a list of caves in Pennsylvania.
- Monongahela Grotto
- North-central West Virginia chapter of the National Speological Society. Includes trip reports, calendar, and photo album.
- MUSS Caving Club
- Manchester based caving club with members around Europe. Site provides photo gallery, newsletters, message board, and meeting schedule.
- National Caves Association (NCA)
- Nonprofit organization of publicly and privately owned natural show caves and caverns developed for public visitation.
- National Speleological Society (7)
- Northeastern Cave Conservancy
- Promotes the study and preservation of speleologically significant properties in the Northeastern United States. Site includes news, event calendar, and membership details.
- Northern New Jersey Grotto
- Official site for the northern New Jersey Grotto. Offers meeting schedule, events, photos, and caving links.
- Pennsylvania Cave Conservancy
- Nonprofit cave conservancy designed to protect cave resources within the Mid-Appalachian region. Site offers news, restricted cave list, event calendar, and links.
- Potomac Speleological Club
- Dedicated to caving, conservation and the science of speleology in West Virginia. Site includes club news, membership details, and more.
- San Francisco Bay Chapter - NSS
- Newsletters, project info, trip reports, calendar of events, and other things of interest to bay area cavers.
- Shropshire Caving and Mining Club
- Serves as a focus for people interested in caving and other underground exploration in all parts of the Britain, the Isle of Man, and Ireland.
- Southeastern Cave Conservancy
- Information about the Southeastern Cave Conservancy group and its mission, meetings and more.
- Speleo Club Zeleznicar
- Information, photography, Slovenian caves, and links. Site language entirely in Slovenian.
- Student Speleologic and Alpinistic Club (ASAK)
- Includes info on Yugoslav speleology and caving: karst areas, caves, cavers and their clubs.
- Sydney Speleological Society
- Includes journal excerpts and publications for sale. Updates weekly about caves and caving on the East Coast of Australia.
- Texas Speleological Survey
- Non-profit organization established in 1961 for maintaining information on Texas caves and karst. Site includes articles, event calendar, photo galleries, and maps.
- Upper Cumberland Grotto Home Cave
- Includes caving, or spelunking, safety and conservation information, as well as photos of caves in the Southeast.
- West Virginia Cave Conservancy
- Dedicated to the education and management to protect the cave and karst resource, and to protect cave access. Site includes event calendar, membership details, newsletter, projects, and committee information.
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