The Natural Capital Center, formally known as the Jean Vollum Natural Capital Center and informally as the Ecotrust Building, is a notable example of green building in Portland, Oregon, United States. It was the first historic redevelopment in the U.S. to receive a gold-level Leadership in Energy and Environmental Design (LEED) award from the U.S. Green Building Council. The building houses a mix of public and private, nonprofit and for-profit tenants.

Ecotrust is a nonprofit organization based in Portland, Oregon, working to create social, economic, and environmental benefit.