Learning disability is a common problem encountered by primary school children. The skills affected are reading, writing, listening, speaking, doing math. Burden of learning disability varies from 3-12% worldwide. If unnoticed, the child can develop depression or anxiety disorders. This study is to assess the knowledge and perception of teachers about learning disabilities among primary school teachers. A cross sectional study was conducted in 6 schools, in Thiruvallur district. The study sample was 138 teachers and their knowledge was assessed by a questionnaire. The result was found to be that knowledge of teachers about learning disability is fair. There is a need to improve the knowledge of teachers and enhance basic skills to recognize children with learning disabilities by introducing the topics in teacher training courses.