KISS原则是英语中Keep it simple,stupid的首字母缩略字。KISS原则是指在设计当中应当注重简约的原则。同时这原则亦有应用在设计电脑软件、动画、工程上。原文当中有很多其他版本,包括:"Keep It Simple & Stupid" (在西欧文学中最常使用), "Keep It Sweet & Simple," "Keep It Short & Simple," "Keep it Simple, Sweetheart," and "Keep it Simple, Sherlock."