Alliance of International Aromatherapists
Professional organization promoting education and higher standards for the aromatherapy industry.

American Botanical Council
The premier herbal research organization and publisher of HerbalGram.

American Herbal Products Association
An association promoting the responsible production, sales and research of herbal products.

Aromatherapy Registration Council

Organization that provides examination and registry to professional aromatherapists who meet their exacting educational standards.

Tony Burfield's excellent watchdog site on endangered aromatic plants, research and aromatherapy myths.

National Association for Holistic Aromatherapy
Professional organization promoting higher standards for the aromatherapy industry.

National Center of Complementary and Integrative Health 
Leading US government agency for scientific research on non-conventional medicine 

United Aromatherapy Effort
Charity which provides donated aromatherapy products and services to relief workers in times of disaster and war.