Starting Points:

American Library Association
Texas Library Association

Academic Libraries:

Association of College and Research Libraries (ACRL)
Association of Research Libraries (ARL)

Regional, State, National and International Organizations:

American Indian Library Association
Association for Library & Information Science Education (ALISE)
Black Caucus of ALA (BCALA)
International Federation of Library Associations & Institutions (IFLA)
REFORMA - The National Association to Promote Library & Information Services to Latinos and the Spanish Speaking

School Libraries:

American Association for School Librarians
International Association of School Librarians
Texas Association of School Librarians

 

Special Libraries:

American Association of Law Libraries
American Medical Informatics Association (AMIA)
American Society for Indexing
Art Libraries Society of North America
Association for Library Collections and Technical Services
Institute of Museum and Library Services (IMLS)
International Council on Archives (ICA)
Medical Library Association
Music Library Association (MLA)
Special Library Association
Public Libraries Association 
​Society of American Archivists
United States National Library of Medicine

Information Science:

Association for Information Science & Technology (ASIS&T)
Association for Educational Communications & Technology (AECT)
Association of Records Managers and Administrators, Inc (ARMA)

Data Science:

 Association for Computing Machinery (ACM)
Institute of Electrical and Electronics Engineers (IEEE)