The International Association of Business Communicators (IABC)
www.iabc.com
The International Association of Business Communicators (IABC) is a business network with the aim of improving marketing communications effectiveness among communication professionals. It serves as a dynamic resource for its members to find potential clients and contacts, access the hidden job market, and enhance their professional skills through a large library of case studies and articles. Its membership consists of approximately 15,000 business communications professionals in over 80 countries.

Advertising Association
http://www.adassoc.org.uk/
The Advertising Association exists to provide a co-ordinated service in the interests of its wider membership (the individual companies that make up this large, diverse, and competitive business). Its remit is 'to promote and protect the rights, responsibilities and role of advertising' in the UK.

The Communications Council
http://www.communicationscouncil.org.au/index.aspx
The Communications Council brings together the AFA, AWARD, and the Account Planning Group. The council aims to develop members and communication organizations by providing professional development services, advocacy, and support. The Council has over 4,500 members from more than 200 organizations.

Direct Marketing Association (DMA)
http://www.the-dma.org/
Founded in 1917, the Direct Marketing Association is the leading global trade association of business and non-profit organizations using and supporting direct marketing tools and techniques. DMA advocates industry standards for responsible marketing, promotes relevance as the key to reaching consumers with desirable offers, and provides cutting-edge research, education, and networking opportunities to improve results throughout the entire direct marketing process.

European Association of Communications Agencies (EACA)
http://eaca.eu/  
The European Association of Communications Agencies, founded in 1959 as the  European Association of Advertising Agencies (EAAA), is the sole central service organization for the European advertising agency industry. The EACA, located in Brussels, combines the knowledge and input of its membership groups: the National Advertising Agency Associations; the International Advertising Agencies, and the pan-European Media Agencies.