The May Fourth Movement (traditional Chinese: 五四運動; simplified Chinese: 五四运动; pinyin: Wǔsì Yùndòng) was an anti-imperialist, cultural, and political movement growing out of student demonstrations in Beijing on May 4, 1919 protesting the Chinese government's weak response to the Treaty of Versailles, especially the Shandong Problem. These demonstrations sparked national protests and marked the upsurge of Chinese nationalism, a shift towards political mobilization and away from cultural activities, and a move towards populist base rather than intellectual elites.
五四运动发生于1919年的5月4日，是一场发生于中国北京、以青年学生为主的学生运动，以及包括广大群众、市民、工商人士等中下阶层广泛参与的一次示威游行、请愿、罢课、罢工、暴力对抗政府等多形式的爱国运动。事件起因在第一次世界大战完结后举行的巴黎和会中，列强肆意践踏中国主权，把德国在山东的权益转让给日本，即山东问题。就此，当时中国的北洋政府未能捍卫国家利益，在列强面前显得软弱，使国人异常不满，从而上街游行表达不满。当时最著名的口号之一是“外抗强权（对抗日本侵权），内除国贼（惩除媚日官员）”。
