Writing Equipment Society
- An organization devoted to the conservation, study, and collection of writing instruments and accessories. Includes articles about pens and pencils, and club information.
- http://www.wesonline.org.uk/

International Fountain Pen Club
- For collectors of the Italian Omas fountain pens, and other pens, with features and benefits of membership. Both English and Italian versions are available.
- http://www.comune.bologna.it/iperbole/clubisas/indexuk.htm

Michigan Pen Collectors
- A collectors club with newsletter, pen show calendar, membership information, and links to other pen sites.
- http://www.michpens.com/

American Pencil Collectors Society
- An organization of pen and pencil collectors from the USA and around the world. A brief history, description, and membership information.
- http://www.pencilcollector.org

Pen Collectors of America
- A non-profit organization to promote interest in fountain pens and pen collecting, and the history, manufacture and use of writing instruments.
- http://www.pencollectors.com

New York City Pen Show
- Features an international event for collectors, dealers and manufacturers with exhibits, sales, and demonstrations. Held in September.
- http://www.nycpenshow.com

Society Of Inkwell Collectors
- Dedicated to establishing and enhancing the hobby of collecting inkwells and writing accessories. Provides its members with an opportunity to meet, communicate, and share information with inkwell collectors worldwide.
- http://www.soic.com/

International Omas Pen Collectors Club
- Official home for the Italian Omas collectors. Both English and Italian versions are available.
- http://www.comune.bologna.it/iperbole/clubisas