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Objective: Schizophrenia is a highly heritable complex disease. The genetic interactions underlying this heritability is still needs to be understood. Linkage studies pointed out the D-amino acid oxidase (DAO) and D-amino acid oxidase activator (DAOA-G72) genes as candidate genes in susceptibility to schizophrenia. The association studies of interaction partners D-amino acid oxidase and D-amino acid oxidase activator gene polymorphisms and schizophrenia has been performed in different studies with different ethnic origins. However these studies showed conflicting results. In this study, it is aimed to examine the effects of several DAO and DAOA polymorphisms in Turkish schizophrenia patients. Methods: In the present study two single nucleotide polymorphisms (SNPs) within DAO gene (rs2111902 and rs3741775) and one in DAOA gene (rs2391191) were genotyped in individuals with Turkish origin from Malatya region on eastern part of Turkey. 96 schizophrenia patients and 100 mentally healthy individuals are the subjects of this study. Results: No significant difference was found in between the controls and schizophrenia sample for the SNPs rs2111902 and rs3741775 of DAO gene but a significant association was found on the allelic level of rs2391191 of DAOA gene. The relationship between aggressive behavior, suicide attempts and genotypes were also evaluated in the patient group. Discussion: A significant association for the G allele of rs2391191 at the allelic level was found, on the other hand no association could be shown between the examined rs2111902 and rs3741775 polymorphisms and the pathology of the disorder in the group of Turkish schizophrenia patients included in this study. [Anadolu Psikiyatri Derg 2016; 17(5.000): 341-346]