- Wageningen University and Research [Wageningen]
- WASCAL Graduate Research Program on West African Climate System
- Washington State University
- Washington University in Saint Louis
- Washington University School of Medicine in St. Louis
- Water - Earth System Science Research Institute
- Water Problems Institute
- Watershed Connections, Inc.
- Wayne State University [Detroit]
- Weather Measures
- Wegener Center for Climate and Global Change
- Weizmann Institute of Science [Rehovot, Israël]
- Wellesley College
- Wesleyan University
- Western Washington University
- Westfälische Wilhelms-Universität Münster = University of Münster
- West Virginia University [Morgantown]
- Wheaton College [Norton]
- Wheeling Jesuit University
- Wigner Research Centre for Physics [Budapest]
- William B. Hanson Center for Space Sciences
- William J. Hughes Technical Center
- William R. Wiley Environmental Molecular Sciences Laboratory
- WindBorne Systems, Inc.
- Wind Energy Division [Roskilde]
- W.M. Keck Laboratory for Space and Planetary Simulation [Fayetteville]
- Wolfson Atmospheric Chemistry Laboratories
- Woodland Trust
- Woods Hole Oceanographic Institution
- Worcester State University [Worcester]
- World Meteorological Organization
- WPO Paris
- Wright State University
- WSU Laboratory for Atmospheric Research
- Wuhan University [China]
- Wyss Academy for Nature