English Guernsey Cattle Society
- Features comprehensive information including recent shows, milk statistics, and suggestions on breed improvement. Provides a photo gallery and forum.
- http://www.guernseycattle.com/

Canadian Guernsey Association
- Provides a newsletter and articles, and allows members to register their cattle.
- http://www.guernseycanada.ca/

Iowa Guernsey Association
- Guernsey cattle breeders in Iowa - includes awards, semen available, and member information.
- http://www.usguernsey.com/iowagba.html

World Guernsey Cattle Federation
- Information and worldwide news about Guernsey cattle
- http://www.worldguernseys.org/

American Guernsey Association
- Provide and promoting programs and services to enhance the value and profitability of the Guernsey Cattle breed for the members, owners and dairy industry worldwide.
- http://www.usguernsey.com/