公共关系（英语：Public Relations）或称公众关系、机构传讯，通常简称PR或公关，是指有关著名人物、商业机构、政府、非牟利机构等各种组织，为改善与社会公众的关系、促进公众对其认识，以树立良好形象、取得公众的理解及支持。

在职业上，公共关系部门主要从事组织机构信息传播，关系协调与形象管理事务的咨询、策划、实施和服务的管理职能。包括选创组织的成功，降低组织失败的影响，宣布变更等等。和中国传统个人关系的中的面子类似。

在市场营销学体系中，公关关系是企业机构唯一一项用来创建公众信任度的工具。

由于社会上的分工越来越细，公关人员的重要性愈显增加，许多大专院校纷纷成立公共关系学系，为社会培养不同领域的公关人才。公关行业的性质使其不可避免地与大众媒体之间具有密切联系。

Public relations (PR) is the practice of managing the spread of information between an individual or an organization (such as a business, government agency, or a nonprofit organization) and the public. Public relations may include an organization or individual gaining exposure to their audiences using topics of public interest and news items that do not require direct payment. This differentiates it from advertising as a form of marketing communications. Public relations is the idea of creating coverage for clients for free, rather than marketing or advertising. An example of good public relations would be generating an article featuring a client, rather than paying for the client to be advertised next to the article. The aim of public relations is to inform the public, prospective customers, investors, partners, employees and other stakeholders and ultimately persuade them to maintain a certain view about the organization, its leadership, products, or political decisions. Public relations professionals typically work for PR and marketing firms, businesses and companies, government, government agencies and public officials as PIOs and nongovernmental organizations and nonprofit organizations. Jobs central to Public Relations include account coordinator, account executive, account supervisor and media relations manager.