A recurrent theme within the literature on the 6 Sigma program is the study of its effect on organizational performance. Therefore, the aim of this study was to investigate the effect of 6 Sigma on culinary quality performance, work commitment, and customer loyalty in the culinary division of hotels and family restaurants. The samples of this study included the employees of the culinary division of hotels and family restaurants that implemented or were about to implement the 6 Sigma program. A total of 248 questionnaires were analyzed with statistical methods of factor analysis, reliability test, and regression analysis. The findings of this study showed that the 6 Sigma program affected the culinary quality performance and work commitment of culinary division employees. Also, the 6 Sigma program, culinary quality performance and work commitment affected customer loyalty. Furthermore, work commitment affected culinary quality performance. Based on these research findings, it is required that the culinary division of hotels and family restaurants should incorporate the 6 Sigma program. For this purpose, good quality data should be collected with sufficient preparation procedures, and task force team should be made. Moreover, experts in this field should be cultivated, with the training of employees in mind. It is also crucial that the current quality of product and services be measured and that all the employees of the culinary division participate in the implementation of the 6 Sigma program. The intervention and heavy participation of the top management and head of the culinary division is expected for the successful implementation of 6 Sigma program.