Objectives: There are wide intra- and interindividual variations in human chewing trajectories. The purpose of this study was to investigate whether interindividual resemblances exist among intraindividual variations in the chewing trajectories of individuals. Methods: The chewing trajectories of eight healthy males who chewed gum in the right side of their mouth were recorded near the lower central incisors by using a jaw-tracking device (K7/CMS; Myotronics-Noromed Inc., USA). The opening and closing phases of a chewing cycle were divided into 20 equal-time intervals at 5% increments, producing a total of 41 points in time. The overall chewing cycle was described using 123 variables that comprised the three-dimensional location of the jaw at these points. The intraindividual variations in 200 chewing trajectories were evaluated with the principal component (PC) analysis based on a variance-covariance matrix of the variables. The variation in the trajectories that was accounted for by each PC was visualized as a reconstructed curve by using an inverse eigenvector matrix. Results: More than 90% of the cycle-to-cycle variations in the chewing trajectory were described as a linear superposition of the changes that were accounted for by four to six PCs in all subjects. The reconstructed curves indicated that the first PC was related to the changes in the gape width in each subject. Among the remaining PCs, two were related to the changes in the jaw-opening direction in the frontal or sagittal planes. These three PCs explained 70% to 80% of the variances. Conclusion: Interindividual resemblances were present among the intraindividual changes in the chewing trajectories that were brought about by three PCs in each subject. This result would suggest that the subjects utilized identical strategies in controlling chewing trajectories.