Introduction: The objective of this study is to find out if there are differences in selective and sustained attention between children with different subtypes of ADHD and children with learning disorders (LD), in order to improve the differential diagnosis between ADHD and PD and between the different subtypes of ADHD. Method: The sample consisted of 437 children who attended a psychology center, of whom 234 had ADHD and 203 had AD (in whom a diagnosis of ADHD was ruled out). Sustained and selective attention tests (Faces, d2, EMAV, AGL, CSAT and CPT-II) were applied to the participants during their evaluation and descriptive analyzes, one-way ANOVAs and planned F tests were performed. Results: The differences between the different indicators of the tests used to measure attention suggest that children with ADHD have difficulties in performance in selective and sustained attention and process information significantly more slowly than children with ED. Discussion and Conclusions: The indicators of some of the tests used could be useful to make a differential diagnosis between children with ADHD and those with PD and to be able to establish an individualized treatment intervention plan.