Background: Many studies have reported impaired empathy in children with Attention Deficit Hyperactivity Disorder. But the main issue(question) is whether Between Dimensions of empathy of children with sluggish cognitive Tempo (which are similar in terms of attention problems to attention deficit hyperactivity disorder, For this reason, Children with sluggish cognitive Tempo are mistakenly labeled attention deficit hyperactivity disorder) there is difference with children with attention deficit hyperactivity disorder. Aims: Comparison of Dimensions of Empathy in children with Attention Deficit/ hyperactivity disorder and Sluggish Cognitive Tempo. Method: The research was descriptive and causal-comparative. The statistical population included Elementary school boys (7 to 12 years old) in Tabriz in the 2019 academic year, of which 100 boys (50 with attention deficit hyperactivity disorder and 50 with sluggish cognitive Tempo) as a sample by multistage cluster sampling model and They were selected using the SNAP-IV rating scale (Swanson, Nolan and Pelham, 1980) and the SCT scale (Penny, Watchbach, Klein, Curcum and Skis, 2009). In order to measure empathy, children's cognitive and emotional empathy scale (Dads et al., 2008) was used. The results were analyzed by multivariate analysis of variance in SPSS20 software. Results: The results showed that there was a significant difference between children with attention deficit hyperactivity disorder and children with sluggish cognitive Tempo (F=15/10, P<0/05). Conclusions: It can be concluded that children with sluggish cognitive Tempo have poorer(weaker) performance in cognitive and emotional empathy than children with attention deficit hyperactivity disorder