Purpose-This study explores the effects of price situations on consumer perceived fairness and purchase intention in online group buying. This study also examines the moderating effects of waiting time and consumer demands on perceived fairness in online group buying. Design/methodology/approach-A 2 x 2 x 2 (price situation: favorable/ unfavorable X demand degree: high/low X waiting time: long/short) online experiment was conducted. Findings-The experiment results demonstrated that consumer perceived fairness increases when facing favorable price situation in online group buying. Demand degree and waiting time moderate the effects of price situation on perceived fairness. Additionally, perceived fairness is positively related to purchase intentions. Research limitations/implications-This study used laboratory test. However, as with most online studies, the possible self-selection bias makes it impossible to confirm that the study participants are representative. Future research could examine perceived fairness and purchase intention in a real market situation. Moreover, this study was conducted in Taiwan using Taiwanese subjects. The results thus may or may not applicable to consumers in other cultures. It would be interesting to find out whether culture influences online group buying intention. Practical implications-This paper provides several managerial implications with online group buying companies. Companies may use consumer demands and waiting time to set price in online group buying. Also, companies may develop different price strategies to create consumer segmentation. Originality/value-This study investigates factors influencing online group-buying intention from the perspective of perceived fairness. It advances the literature on consumer perceived fairness literature in explaining online group buying behaviors.