- Society for Human Resource Management (SHRM)@
- American Institute of Architects
 - Dedicated to the highest standards of professionalism, integrity, and competence. - National Council Of Teachers Of Mathematics
- Reston
- National Society of Professional Engineers@
- Water Environment Federation
- Alexandria - Technical and regulatory information for environmental professionals and the public.
- American Society of Landscape Architects
- Information, products, and services for landscape architects and related design professionals.
- National Institute for Automotive Service Excellence
- Herndon - Nonprofit, independent organization that provides voluntary ASE testing and certification for automotive service professionals.
- National Association of Social Workers
- Mission is to strengthen and unify the profession, promote the development of social work practice, and advance sound social policies.
- National Association of Manufacturers
- Multi-industry trade association advancing a pro-growth, pro-worker policy agenda.
- American Society of Association Executives
- Individual membership organization of 23,000+ association executives and suppliers.
- National Business Travel Association (NBTA)
- Alexandria - Represents the interests of corporate travel managers and travel service providers.
- National Press Club
- Established in 1908 in part to foster the ethical standards of the profession.
- National Association of Health Underwriters
- Institute of Management Consultants USA (IMC USA)
- National professional association representing management consultants and awarding the Certified Management Consultant(CMC)certification mark.
- Association for Financial Professionals
- Bethesda - Offers details of jobs for finance professionals, career development, financial tools, and more.
- Chimney Safety Institute of America
- Gaithersburg - A nonprofit educational foundation dedicated to the certification and accreditation of chimney sweeps.
- National Society of Fund Raising Executives
- Alexandria - Professional association for fundraising executives who work for not-for-profit and philanthropic organizations.
- National Association of Telecommunications Officiers and Advisors
- Representing cable TV franchise authorities on matters of federal regulation. NATOA chapters form the foundation for of the national organization.
- International Biometric Industry Association
- Trade association advancing the interests of the biometric industry. Offers public information and advocacy on behalf of biometric manufacturers, integrators and end users.
- Society of Consumer Affairs Professionals in Business (SOCAP)@
- Alexandria
- IAPSC - International Association of Professional Security Consultants
- Site includes a directory of security consultants, a library of security related articles; and information about the high standards required for membership in the IAPSC.
- International Furnishings and Design Association (IFDA)
- Alliance of leaders from the furnishings and design industry.
- Organization of Women in International Trade
- Nonprofit professional organization designed to promote women doing business in international trade by providing networking and educational opportunities.
- Society of Satellite Professionals
- Arlington
- Park Law Enforcement Association
- Arlington
- Greater Washington (GWSAE)
- Employee Assistance Professionals Association
- Arlington
- Independent Educational Consultants Association
- Fairfax - Professional association of full-time educational consultants.
- Connected International Meeting Professionals Association
- Fairfax - Information on certification, membership, conferences, clicknplan global network, lists of planners and suppliers, and more.
- Art Directors Club of Metropolitan Washington
- Reston - Dedicated to advocating professionalism in the field of visual communications.
- National Gay Pilots Association
- Provides an affirming social and professional network for gay and lesbian aviators.
- Washington Romance Writers
- An affiliate chapter.
- National Hispanic Corporate Council
- McLean - Resource for information, expertise and counsel on selected Hispanic issues affecting corporate objectives.
- National Capital Chapter of the Public Relations Society of America
- Fairfax - Resources for public relations professionals, journalists, and other communicators; provides a referral service for positions in the greater DC area.
- National Public Employer Labor Relations Association (NPELRA)
- Nationwide organization of public sector professionals employed by federal, state, and local governments, and school and special districts.
- Society for Technical Communication
- Organization of technical writers, editors, graphic designers, webmasters, and translators.
- Association of Practicing CPAs (APCPA)
- Rockville - Provides a forum for CPAs to network with others by mentoring, teaching, learning, & sharing business opportunities.
- National Association of Personnel Services
- Alexandria - Represents permanent placement and temporary staffing firms.
- American Institute of Architects - Potomac Valley Chapter
- Silver Spring
- National Black MBA Association
- Striving to strengthen the economic and intellectual wealth of the African American community.
- Council for LAB/LAS Environmental Research (CLER)
- Conducts and distributes research on the environmental safety of linear alkylbenzene sulfonate (LAS) and linear alkylbenzene (LAB).
- Organization of Black Designers (OBD)
- Nonprofit association dedicated to addressing the unique needs of African American design professionals.
- Virginia Business and Professional Women
- Works to achieve equity for all women in the workplace through advocacy, education and information.
- Professional Videographers' Association of Greater DC
- Promoting the general interests and goodwill of videography.
- Business Network International Gaithersburg
- Gaithersburg - Includes a directory of businesses.
- Women's National Book Association (WNBA) - Washington Chapter
- Gives visibility and support to women in publishing, brings together women and men active in that world, and provides a forum for the exchange of ideas and info.
- Catholic Business Association
- Charles County - Fellowship of Catholic business and professional men and women.
- District of Columbia Bicycle Courier Association
- Dedicated to protecting and promoting the rights of bike couriers, and promoting the bicycle as an alternative means of transportation.
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