Background: IQ is important toward the intelligence development amongst children. The result of IQ score can be determined by internal and external factors. IQ score amongst children in endemic areas of iodine deficiency disorder is suspected influenced by thyroid function disorder. TSH concentration portrays the thyroid function. The elevated TSH concentration shows that there is an insufficiency of T3 receptor saturation in the brain and potentially causes developmental disorders of intelligence. Aim: It aims to determine the relation between TSH concentration and intelligence quotient score amongst elementary school students at endemic areas of iodine deficiency disorders Samigaluh, Kulonprogo, Yogyakarta. Methods: This research was conducted under analytic correlative design with the cross-sectional approach. This research took place at two Elementary Schools in Samigaluh subdistrict started on May 2016 to April 2018. Samigaluh was choosen due to its status as endemic areas of iodine deficiency disorders. There were 58 total samples. Data analysis was done by using Pearson correlation. Result: There were 74,1% children with normal TSH who have average IQ score 89,35 and 24,9% children with hipertirotropinemia who have IQ score 101,00. There is no correlation between TSH concentration and IQ score (p=0.05) Conclusion: There is no relation between TSH concentration and intelligence quotient Score amongst elementary school students in Samigaluh Kulonprogo.