Houston Group of the Sierra Club
- Local conservation and outdoor activities group. Works on protecting Katy Prairie, Armand Bayou, Galveston Bay and Sam Houston National Forest. Provides information and local activities.
- http://texas.sierraclub.org/houston/

Lone Star Chapter of the Sierra Club
- Texas-based environmental organization focused on conservation and outdoor recreation. Works to preserve the environment, energy, and clean water, and to stop global warming. Includes calendar, mailing list, newsletter, how to get involved, action alerts,
- http://texas.sierraclub.org/

Dallas Sierra Club
- Outdoor and environmental group in Dallas, Texas. Provides information and local activities. Outings including; hikes, car camping, bicycling, canoeing and back packing; operate as a not-for-profit service.
- http://texas.sierraclub.org/dallas/

The Alamo Group of the Sierra Club
- Activities of the San Antonio, Texas group of the Sierra Club. Has links to outdoor activities, political activism, local environmental issues.
- http://texas.sierraclub.org/alamo/