All Trombones: Based in Worcester and formed by trombonist Chris License, expect to find a list of links, PDF downloads of catalogs and selected trombone solos, diary of upcoming events, merchandise, newsletter, shop, mailing list, and contact information.
British Trombone Society: Details about the society, history, membership information, officers, classified ads, and links.
Finnish Trombone and Tuba Association: Introduction to the group, contact details, concerts, and archives.
International Trombone Association: Dedicated to the advancement of trombone teaching, performance and literature.
The Historic Brass Society: History of brass instruments, journal information, publications.
Trombone Club Online: From trombonist Mark Rannis in Wisconsin. Discussion for trombone players, chat, articles, tips, profiles, and links.
Trombonists' Anonymous: A Yahoo! Group devoted to discussion about the trombone.