Izaak Walton League of America, Frederick Chapter
- Offers hunter safety courses, archery and muzzleloading instruction. Also has rifle, pistol and archery ranges. Engages in conservation and ecological politics. (Frederick)
- http://www.frederickiwla.org/

Chesapeake Hiking and Outdoor Society
- Members participate in hiking, biking, canoeing, and camping. Includes schedule, trip reports and photos, forum, and membership information. (Annapolis)
- http://www.chaoshikers.org/

Terrapin Trail Club
- A student organization that sponsors outdoor activities such as hiking, backpacking, camping, biking, caving, climbing, and kayaking. Membership is available to registered students, faculty, and staff of the University of Maryland. Includes schedule, pho
- http://www.ttc.umd.edu/

Maryland Outdoor Club
- Promoting adventure sports, travel, and social activities statewide. Includes club background, upcoming events, membership information, and area happenings.
- http://www.marylandoutdoorclub.org

Johns Hopkins Outdoors Club
- Runs weekend trips including caving, climbing, and backpacking. Hopkins affiliates are invited. Equipment rental offered. Also includes schedule and list of officers. (Baltimore)
- http://www.jhu.edu/~outdoors/