The Main Street Institute
Works with communities across the nation to revitalize their historic or traditional commercial areas.

National Preservation Institute
The NPI is a nonprofit organization offering specialized information, continuing education, and professional training for the management, development and preservation of historic, cultural and environment resources.

National Trust for Historic Preservation
The NTHP is committed to saving America's diverse historic environments.

Partners for Sacred Places
The Partners for Sacred Places focuses on preservation of historic religious properties.

Preservation Trades Network
The PTN is a non-profit organization that brings together the building trades in the field of historic preservation.

Recent Past Preservation Network
This network is dedicated to promoting the preservation of buildings from the recent past.

Theatre Historical Society of America
This society is dedicated to documenting the rich heritage of historic theatres in the United States.

Advisory Council on Historic Preservation
This group promotes historic preservation and advises the President and Congress on historic preservation policy.

American Institute of Architects
This is an association for building and design industry professionals.

International Centre for the Study of the Preservation and the Restoration of Cultural Property. (ICCROM)

International Council on Monuments (ICOMOS)

Save America's Treasures
This organization is a national effort to protect America's threatened cultural treasures.

Preservation Action
This is a network of community activists, preservation professionals, historians, commercial investors, and civic leaders working together to advocate for our architectural heritage.

Texas Historic Commission
The THC consults with citizens and organizations to preserve Texas' architectural and cultural landmarks.