同侪压力（英语：Peer pressure）或称同辈压力、朋辈压力，指的是同侪施加的的一种影响力，它可以鼓励一个人为了遵守团体社会规范而改变其态度、价值观、行为。相关社会团体包括会员团体（当个人“正式”成为会员，如政党和工会）或社会派系。受朋辈压力影响的个人不一定愿意属于这些团体。

朋辈压力，西方学术上解释为：因害怕被同伴排挤而放弃自我做出顺应别人的选择。但现在，这个概念似乎还要外加一层，也就是还要包括同辈（即与自己年龄、地位、所处环境相似的人）取得的成就所带给自己的心理压力。

Peer pressure (or social pressure) is influence a peer group, observers, or an individual exerts that encourages others to change their attitudes, values, or behaviors to conform to those of the influencing group or individual. Social groups affected include both membership groups, in which individuals are "formally" members (such as political parties and trade unions), and cliques in which membership is not clearly defined. However, a person does not need to be a member or be seeking membership of a group to be affected by peer pressure. One may also recognize dissociative groups, with which one wishes to avoid associating, and thus behave counter to that group's norms.