Background Whether glutathione S-transferase (GST) null polymorphisms, namelyGSTM1null,GSTP1null andGSTT1null polymorphisms, influence the risk of coronary artery disease (CAD) or not remains unclear. Thus, the authors performed a meta-analysis to more robustly estimate associations betweenGSTnull polymorphisms and the risk of CAD by integrating the results of previous publications. Methods Medline, Embase, Wanfang, VIP and CNKI were searched comprehensively for eligible studies, and 45 genetic association studies were finally selected to be included in this meta-analysis. Results We found thatGSTM1null polymorphism was significantly associated with the risk of CAD in overall population (OR = 1.37,p = 0.003) and mixed population (OR = 1.61,p = 0.004),GSTP1null polymorphism was significantly associated with the risk of CAD in overall population (OR = 1.23,p = 0.03), whereasGSTT1null polymorphism was significantly associated with the risk of CAD in overall population (OR = 1.23,p = 0.02), Caucasians (OR = 1.23,p = 0.02) and East Asians (OR = 1.38,p < 0.0001). Conclusions This meta-analysis demonstrated thatGSTM1null,GSTP1null andGSTT1null polymorphisms were all significantly associated with an increased risk of CAD.