Humanoid robots generated by inspiring by human appearances and abilities have became essential in human society to improve the quality of their life. All over the world, there have been many researchers who have focused on humanoid robots to develop the capabilities of humanoid robots. Generally, humanoid robot systems include mechanisms of decision making and information processing. Because of the uncertainty behind decision making and information processes, fuzzy sets are used most commonly. This study investigates a comprehensive literature review about humanoid robots that presents the recent technological developments and the theories associated with fuzzy set models. The basic principles and concepts of fuzzy sets for humanoid robots are presented. (C) 2020 Elsevier B.V. All rights reserved.