Science, Tech, Math › Social Sciences Interest Group Share Flipboard Email Print Social Sciences Sociology Key Concepts Major Sociologists Deviance & Crime News & Issues Research, Samples, and Statistics Recommended Reading Psychology Archaeology Economics Environment Ergonomics Maritime By Ashley Crossman Updated March 04, 2016 Definition: An interest group is an organization whose purpose is to influence the distribution and use of political power in a society. This is done mainly through influencing elected officials (i.e. lobbying) by providing information promoting a particular point of view or by offering support for reelection. Some interest groups, like antiabortion groups, exist primarily to do the lobbying of their group. For other organizations, like labor unions, corporations, or the military, lobbying is secondary to a variety of other activities.