校友会又名联谊会、同学会，是社会组织，成员主要是校友和旧同学，亦有同间公司、军队等机构在职或离职员工组成的联谊会组织，英文称为「Coporate Alumni」。

一般校友会在法律下登记为社团法人。一般校友会的章程，规定其内部架构有会员大会、理事、监事等职位。

An alumni association is an association of graduates or, more broadly, of former students (alumni). In the United Kingdom and the United States, alumni of universities, colleges, schools (especially independent schools), fraternities, and sororities often form groups with alumni from the same organization. These associations often organize social events, publish newsletters or magazines, and raise funds for the organization. Many provide a variety of benefits and services that help alumni maintain connections to their educational institution and fellow graduates. In the US, most associations do not require its members to be an alumnus of a university to enjoy membership and privileges.