In this study the effects of using interactive white board on primary school students’ achievement in teaching English were examined. The sample of this study is comprised of 146 students doing 4th grade English classes at Şehit Teğmen Ali Yılmaz Primary School. According to the statistical analysis results, working group was divided into two groups as the experimental group and the control group. The subject of the research was “Home Sweet Home” Unit 6, with the topics of “House rooms, furniture and prepositions”, chosen from 4th grade English student’s book were taught by using IWB to experimental group for 75 students and using blackboard to control group for 71 students. The success of experimental and control group students were investigated by English Achievement Test, a multiple choice test, which is divided into pretests and pro-tests. The results of the tests were evaluated by using SPSS 16.00 package program. Findings, resulting in a significant difference, show that the use of IWB increases the students’ English academic success when compared to the use of blackboard and using IWB in teaching English affects primary school students’ achievement positively. As a result, this study will work useful for teachers and students at every field of education.