Links to local and national organizations involved in bicycle advocacy:

Adventure Cycling Association
America Bikes
American Bicycle Association
Association of Pedestrian and Bicycle Professionals
Bicycle Friendly Community
Bicycle Helmet Safety Institute
Bike Houston
Bikes Belong Coalition
National Biking Association
National Center of Bicycling and Walking
League of American Bicyclists
Pedals for Progress
Rails to Trails Conservancy
Ride of Silence
Texas Bicycle Coalition
Thunderhead Alliance
ProBicycle.Com