Siyar NA, et al. - Researchers conducted the study for exploring the impact of cognitive‐behavioural therapy (CBT) on emotional regulation and quality of life (QoL) in children with haemophilia using quasi‐experimental research with pretest and post‐test design and a control group. Using convenient sampling, 30 individuals were chosen and divided into two groups (n = 15). The experimental group had a significantly higher QoL and emotion regulation than the control group. The CBT training was effective in helping them to stop negative thinking and control their anger at school, as well as to adopt more appropriate strategies for dealing effectively with concerns in social situations. Being aware of one's thoughts, feelings, and behaviours, as well as being able to solve problems, enables children to have better social relationships and friendships with peers, as well as in other social situations. It can also improve QoL and emotion regulation.