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Introduction: Blood type is a genetic characteristic that is related to some diseases and deformities. The di verse characteristics of pathological lesions complicate the prediction of genetic pattern of a specific cyst or tumor. Nevertheless, epidemiological evaluations can reveal relationships between some lesions or accompanying dis eases as well as some genetic characteristics of the patient. These associations will help to guide the identification and treatment of lesions. Objectives: This study aimed to evaluate the relationship between blood groups and the incidence of odonto genic cysts and tumors. Material and methods: Simple random sampling was performed in this retrospective study. A total of 129 cases that were histopathologically diagnosed with a radicular cyst, odontogenic keratocyst, dentigerous cyst, or ameloblastoma, between 2005 and 2016 with complete data were evaluated. Results: Among 129 cases, 76 (58.9%) and 53 (41.1%) cases were male and female, respectively. Among all cases, 51 (39.5%), 38 (29.4%), 22 (17.1%), and 18 (14%) had O, A, B, or AB blood types, respectively. Among these cases, 47 (36.4%), 39 (30.2%), 22 (17.1%), and 21 (16.3) had a dentigerous cyst, odontogenic keratocyst, radicular cyst, or ameloblastoma, respectively. Conclusions: Blood groups "B" and "AB" are associated with a high incidence of odontogenic lesions and dentige rous cysts.