The aim of this study was to determine whether serum VEGF, IGF-1, and HIF-1[alpha] levels differed between Autism Spectrum Disorder (ASD) patients and healthy controls. A total of 40 children with ASD and 40 healthy controls aged 4-12 years were included. Serum levels of VEGF, IGF-1, and HIF-1[alpha] were measured using commercial enzyme-linked immunosorbent assay kits. Serum IGF-1 levels were found to be statistically significantly higher in the ASD group than in the control group. Serum HIF-1-[alpha] levels were borderline significantly lower in the ASD group. There was no statistically significant difference in serum VEGF levels between the two groups. IGF-1 and HIF-1[alpha] may play a potential role in the etiopathogenesis of ASD.