Asia

Japanese Purchasing Network Guidelines

Hong Kong Centre of Environmental Information Service

North America
The Canadian Green Purchasing Network
US National Association of Countries' Environment Preferable Purchasing
US Environment Protection Agency's Environmentally Preferable Purchasing
US Environment Protection Agency's Environmentally Preferable Products and Services Database
US Energystar Product List
Environment Canada Greener Procurement Site
State University of New York
Green Procurement Checklist Environment Canada
Greening Government - Government of Canada Editor's Choice!
Directions on Greening Government Operations Government of Canada
Green Procurement Reporting Framework Government of Canada
Greening Government Operations Canada Department of Foreign Affairs
Environmental Management Systems Auditor General of Canada
State of Massachusetts Operational Services Division
International Institute for Sustainable Development
Green Workplace Government of New Brunswick
Green Business Letter Environmental News Network
King County (Seattle)
Government Purchasing Project Publishers of 40 Ways to Green Government
US Department of Energy

Europe
European Procurement Service for the Information Age
Swiss Canton of Basel, Procurement Site
Swiss "Community on Ecology and the Market", Green Procurement Site
European Union's Public Procurement Site
A European Information Exchange Network on Green Products and Services
German Counselling Service on (among others) Sustainable Procurement
Danish GreenNet Service: Green Purchasing Site
United Kingdom's Department of Environment, Transport and Regions: Greening Government Operations
Stroud District Council (England)
University of Sunderland (U.K.)  
Norwegian GRIP Environment Centre: Purchasing Site

International
International Council for Local Environmental Initiatives' European Eco-procurement Initiative
UNEP - Sustainable Consumption & Green Procurement
Greening the Halifax G7 Summit