FEN member organizations include:
- American Association of University Professors (AAUP)
- American Booksellers Foundation for Free Expression (ABFFE)
- American Civil Liberties Union (ACLU)
- American Library Association, Office of Intellectual Freedom (ALA-OIF)
- American Society of Newspaper Editors
- Association of American Publishers (AAP)
- Association of American University Presses (AAUP)
- Center for Democracy and Technology (CDT)
- Comic Book Legal Defense Fund
- Dramatists Guild of America (DGA)
- Electronic Frontier Foundation (EFF)
- Feminists for Free Expression
- First Amendment Center Freedom Forum
- First Amendment Project
- Foundation for Individual Rights in Education (FIRE)
- Free Expression Policy Project (FEPP)
- Freedom to Read Foundation
- Friends Committee on National Legislation
- Media Coalition
- Media Law Resource Center, Inc.
- National Coalition Against Censorship (NCAC)
- National Council of Teachers of English
- National Youth Rights Association (NYRA)
- OpenTheGovernment.org
- Peacefire
- PEN American Center
- PEN USA
- People for the American Way (PFAW)
- Radio Free Asia (RFA)
- Student Press Law Center (SPLC)
- The Thomas Jefferson Center for the Protection of Free Expression
- Tully Center for Free Speech
- Washington Independent Writers Freedom to Write Fund
- Woodhull Sexual Freedom Alliance


