A trade association, also known as an industry trade group, business association or sector association, is an organization founded and funded by businesses that operate in a specific industry. An industry trade association participates in public relations activities such as advertising, education, political donations, lobbying and publishing, but its main focus is collaboration between companies, or standardization. Associations may offer other services, such as producing conferences, networking or charitable events or offering classes or educational materials. Many associations are non-profit organizations governed by bylaws and directed by officers who are also members.

In countries with a social market economy the role of trade associations is often taken by employers' organizations which also have a role in the social dialogue.

One of the primary purposes of trade groups, particularly in the United States and to a similar but lesser extent elsewhere, is to attempt to influence public policy in a direction favorable to the group's members. This can take the form of contributions to the campaigns of political candidates and parties through Political Action Committees (PACs); contributions to "issue" campaigns not tied to a candidate or party; and lobbying legislators to support or oppose particular legislation. In addition, trade groups attempt to influence the activities of regulatory bodies.^{[citation needed]}