Abstract: The aim of this study was to evaluate the effects of iron deficiency on intelligence of 11-17 years students. This study conducted on the 540 students (11-17 years) that educated at guidance and high school of Boroujerd city. Laboratory investigations were included serum iron, TIBC (total iron binding capacity) and ferretin. Riven matrix was used in order to determine intelligence quotient. Data were analyzed using SPSS 13 and χ ² and t-tests. Results showed that 78 (14.4%) students had iron deficiency and 14 (25.9%) had iron deficiency anemia. There was no significant difference between different sexes for iron deficiency distribution (p>0.05), while iron deficiency anemia was significantly higher in girls as compared with boys (p>0.05). Mean quotient was 115 ±12.1 in iron deficiency students, while it was 113.7 ±13.9 in patients without iron deficiency. There was also no significant difference between normal and iron deficient students for intelligence quotient (p>0.05).