This study aims to examine emotion recognition and false belief performances of 4–5-year-old (48–71 months) deaf or hard-of-hearing (DHH) children. The performances have been assessed using the Turkish Version of the Theory of Mind Task Battery for Children. The DHH children have been continuing schooling in inclusive settings with an auditory-oral approach. The emotion recognition performances of hearing children (n = 100) and DHH (n = 100) children have appeared to be similar. The ANOVA analysis has revealed that the groups do not differ concerning false belief performances between the ages of 4 and 5.5. However, from the age of 5.5, hearing children have performed better than DHH children. According to correlation analysis, parental education has been determined as a remarkable factor in DHH children’s false belief development. The findings point to the need for research across a wide range of ages to better understand the developmental course of false belief in DHH children.