Library buttons are a common device used by libraries to promote library services and programs. They are also used by professional library associations to promote conferences and activities at those conferences. Library vendors frequently take advantage of buttons to promote their products and services to librarians. It's easy to see why they are a popular collectible among librarians. Over the years I have collected hundreds of library related buttons. I've selected a few to include on a Library Buttons page at the Library History Buff website.