Professional development organizations with a mental health focus:
American Counseling Association: https://www.counseling.org/
American College Counseling Association: http://www.collegecounseling.org/
American College Health Association: http://www.acha.org
Association for University and College Counseling Center Directors: https://www.aucccd.org/
Higher Education Mental Health Alliance: https://hemha.org/
Professional development organizations with a general student affairs focus:
American College Personnel Association: https://www.myacpa.org/
Student Affairs Administrators in Higher Education: https://www.naspa.org/home