This study aimed to investigate the impact of a recreational behavioural programme on reducing the degree of anger among children with intellectual disabilities (ID) in the primary stage. The study was implemented with 24 children who were randomly divided into two groups: an experimental group (n = 12, age = 10.80 ± 1.03 years, IQ = 63.10 ± 4.43 scores, ASW = 55.50 ± 1.51 scores) and a control group (n = 12, age = 10.80 ± 0.92 years, IQ = 63.00 ± 4.16 scores, ASW = 56.00 ± 1.15 scores). We used the PROMIS anger scale with a modification that was used to measure the degree of anger, and the recreational behavioural programme was implemented three times per week for six weeks. The results of the research showed that the improvement percentages for Anger Triggers (AT), Inner Anger (IA), and External Anger (EA) were 9.73%, 9.04%, and 9.60%, respectively, and the Anger scale as a whole (ASW) rate was 9.46%. r = (0.89–0.91). The experimental group using the recreational behavioural programme also outperformed the control group, as the results indicated a decrease in the intensity of anger in the direction of the experimental group. The differences in the improvement percentages for Anger Triggers (AT) Inner Anger (IA), and External Anger (EA) were 32.97%, 31.03%, and 26.63%, respectively, and the Anger scale as a whole (ASW) rate was 30.09%, r = (0.82–0.86). The results of the study confirmed the effectiveness of the recreational activity programme in developing social interaction among children with intellectual disabilities, which indicates the success of the recreational behavioural programme in reducing the degree of anger among children with IDs. Therefore, the recreational behavioural programme had a positive effect in terms of reducing the degree of anger among children with IDs in the primary stage.