Quintana Roo Speleological Survey
- Supports the safe exploration, survey and cartography of the underwater caves and cenotes. Includes maps, conservation notes, geologic history and contact information.
- http://www.caves.org/project/qrss/

Association for Mexican Cave Studies
- Participates in the study, exploration and conservation of caves in Mexico. Official project of the National Speleological Society since 2001. Includes contact information.
- http://www.amcs-pubs.org/

Proyecto Cerro Rabón
- Speleological exploration in the Cerro Rabón area of the Sierra Mazateca, Oaxaca, Mexico. Galleries, journals, pictures and newsletters.
- http://www.cerro-rabon.org

Mexico Profundo
- Founded in 1982 and devoted to exploration, surveying and mapping of water-filled caves. Includes descriptions of projects, expedition journals and contact information.
- http://www.mexicoprofundo.org/

Grupo de Exploracion Ox Bel Ha
- A club dedicated to the exploration, survey and research of the cenotes and underground rivers of the Yucatan Peninsula.
- http://www.mexicocavediving.com