Bottle Related:

Federation of Historical Bottle Collectors ~

International Perfume Bottle Association ~

By maker:

Cambridge Collectors, National

Duncan Glass Society, National ~ Washington, Pennsylvania ~

Fenton Association, The Pacific Northwest

Fenton Finders of Greater Kansas City

Fenton Glass Society, National ~ Marietta, Ohio

Fostoria Glass Society of America ~ Moundsville West Virginia

Heisey Collectors of America ~ Newark, Ohio ~

Heisey Glass Club of California

Greentown Glass Association, National ~ Greentown, Indiana
Promoting education and research on the history and products of the Indiana Tumbler and Goblet Company.

Lalique Mascot Collectors' Club
A website dedicated to one man's work.. René Jules Lalique (1860 - 1945)

Old Morgantown Glass Collectors Guild

Tiffin Glass Collectors Club

Westmoreland Collectors Glass Club, National

Cut Glass groups:

American Cut Glass Association (ACGA) ~

Carder Steuben Club, The
The Carder Steuben Club is to encourage and promote the collecting and enjoyment of Steuben glass
developed by Frederick Carder and produced during the period from 1903 through 1933, and post-Carder
or modern Steuben glass produced from 1933 through 2011

Depression & Elegant Era Glass:

Crescent City Depression Glass Society Crescent City ~
Interest in collecting Depression Era glassware and American glassware of the 40’s, 50’s & 60’s.

DelMarVa Depression Glass Club ~
The club focuses mostly on the 20th century American glassware from the Great Depression era.

Heart of America Glass Collectors
To acquire a broader knowledge of glassware manufactured during the Depression and Post-Depression eras. 

Houston Glass Club ~ Houston, Texas ~

Michigan Depression Glass Society ~

National Depression Glass Association ~

Rocky Mountain Depression Glass Society ~ Denver, Colorado

multi-glass interest:

ART GLASS FORUM ~ New York, NY

Cape Cod Glass Club, Chapter, NAGC
A group of glass collectors, students of glass design and manufacture, who gather to become educated in identifying and learning about all types of glass - old and new, American and foreign, blown and pressed.

Founders Chapter, NAGC ~
An educational organization for those interested in the study and appreciation of glass, of all types and periods.The club's membership includes those from the professional glass world, such as antique dealers, museum curators and authors, as well as those from the general public who have an appreciation for glass as an art form. Through discussion, exploration, and identification, we are able to enjoy and understand the delicate art of glass making.

Glass Circle ~ London, UK ~
The Glass Society concerns itself with all types of glass, both historical and contemporary, and through its visits, meetings and publications, seeks to cater for a wide range of glass interests. Whether you are a collector of glass, an antique dealer, a museum curator, or you are involved in the making of glass, the Glass Society has something to offer.

Object / pattern related:

Milk Glass Collectors Society, National

Moon and Star Pattern Glassware, Society of ~ Frederick, Maryland

Promotional Glass Collectors Association

PYREX - Vintage Pyrex Kitchenware, Collectors Weekly

Reamer Collectors Association, National ~

Salt and Sugar Shakers, Antique Glass ~
This group is dedicated to the collecting and identification of Antique Glass Salt and Sugar Shakers.

Stretch Glass Society, The ~ Sunbury, Ohio~

Toothpick Holder Collectors Society, National

Vaseline Glass Collectors ~ Russellville, Missouri

lighting:

Historical Lighting Society of Canada ~

pattern glass:

Early American Pattern Glass Society ~
"Glass ID Search Tool"
Founded to foster and encourage the collection, appreciation, study, preservation and documentation
of early American Pattern Glassware (EAPG), its makers, and its place in American life, past and present.

paperweights:

Delaware Valley Paperweight Collectors Association
DVPCA is an unincorporated educational organization of member/collectors nationwide.

New England Paperweight Collectors Association ~

Northern Paperweight Society ~ United Kingdom ~

Paperweight Collectors Association, The ~

Paperweight Collectors Association, The - Venezuela

Paperweight Collectors Association of Canada

Paperweight Collectors Association of Texas ~

Misc:

Pressglass-korrespondenz - Munich, Germany