Chatter in the machining system can result in a decrease in tool life, poor surface finish, conservative cutting parameters, etc. Despite many review papers promoting the understanding and research of this area, chatter suppression techniques are generally discussed within limited pages in the framework of comprehensive chatter-related problems. In recent years, the developments of smart materials, advanced sensing techniques, and more effective control strategies have led to some new progress in chatter suppression. Meanwhile, the widely used thin-walled parts present more and more severe machining challenges in their milling processes. Considering the above deficiencies, this paper summarizes the current state of the art in milling chatter suppression. New classifications of chatter suppression techniques are proposed according to the working principle and control target. Based on the new classified framework, the mechanism and comparisons of different chatter suppression strategies are reviewed. Besides, the current challenges and potential tendencies of milling chatter suppression techniques are highlighted. Intellectualization, integration, compactness, adaptability to workpiece geometry, and the collaboration of multiple control methods are predicted to be important trends in the future.