The aim of this study is to evaluate the efficacy of Montessori education which is offered to upskill the attention gathering skill of children with attention-deficit/hyperactivity disorder. In total fifteen pre-schooler participants, six girls and nine boys who are diagnosed with ADHD (7 of the children with ADHD, 8 with only AD), joined to this research. This is a research designed with pre-post test design study with a control group of experimental design. In this research with the aim of improving the attention gathering level; eye-hand coordination, development of tactile, visual and auditory senses and for improving their acquired distinctiveness "tactile boards, sound boxes, binomial cubes and color tablets" are used from Montessori materials. FTFK Attention test is applied to children before and after the intervention. After the training, when scores are compared, the significant improvement is seen in their post test scores.