- Bald Eagle Grotto - Williamsport, Pennsylvania
www.kbsb.com/beg
- Greater Allentown Grotto - Allentown, Pennsylvania
members.tripod.com/~Flycatcher/gag2.html
- Greater Allentown Grotto - A chapter of the National Speleological Society dedicated to the study and conservation of caves and their natural contents.
packratscat.tripod.com
- Huntindon County Cave Hunters - Huntingdon County, Pennsylvania
www.geocities.com/Yosemite/3766
- Loyalhanna Grotto - Indiana, Pennsylvania
www.karst.org/loyalhanna
- Mid-Atlantic Karst Conservancy - Western Pennsylvania organisation focussing on preserving and managing caves and karst areas as well as the education of landowners, cavers, and the general public.
www.karst.org
- Nittany Grotto - State College, Pennsylvania
www.clubs.psu.edu/NittanyGrotto
- Philadelphia Grotto - Philadelphia, Pennsylvania
www.caves.org/grotto/philly
- Pittsburgh Grotto - NSS Grotto based in Pittsburgh, Pennsylvania, USA
www.karst.org/pgrotto
- York Grotto - York, Pennsylvania
www.caves.org/grotto/york
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