| Washington Crossing Audubon Society | NJ |
| Water Watch | OR |
| Waukesha County Environmental Action League | WI |
| West Michigan Environmental Action Council | MI |
| West Virgina Rivers Coalition | WV |
| Western Nebraska Resources Council | NE |
| Western North Carolina Alliance | NC |
| Western Watersheds Project | ID |
| Western Watersheds Project | ID |
| Western Wildlife Conservancy | UT |
| Western Wildlife Outreach | Washington |
| Whale and Dolphin Conservation - North America | MA |
| Whale Conservation Institute | MA |
| Whidbey Environmental Action Network | WA |
| Wild Arizona | AZ |
| Wild Earth | TX |
| Wild Earth Guardians | NM |
| Wild Farm Alliance | California |
| Wild Farm Alliance | CA |
| Wild Fish Conservancy | WA |
| WILD Foundation | CO |
| Wild South | NC |
| Wilderness Society | DC |
| Wilderness Study Group | TX |
| Wildlands Network | DC |
| Wildlife Alliance of Maine | ME |
| Wildlife for All | NM |
| Wildlife Rehabilitators Association of Massachusetts | MA |
| Wildlife Society | MD |
| Wisconsin Audubon Council | WI |
| Wissahickon Restoration Volunteers | PA |
| Wolf Conservation Center | NY |
| Wolf Education and Research Center | OR |
| Wolf Haven International | WA |
| Wolf Hollow | MA |
| Wolf Recovery Foundation | ID |
| World Society for the Protection of Animals | MA |
| World Stewardship Institute | CA |
| World Wildlife Fund | DC |
| Wyoming Outdoor Council | WY |
| Wyoming Untrapped | WY |
| Wyoming Wildlife Advocates | WY |
| Xerces Society | OR |
| Zoo New England | MA |
| Zoological Association of America | FL |
| Zoological Society of Philadelphia | PA |
