Recent evidence showed that it is possible to help children's Theory of Mind (ToM) development during preschool and middle childhood. This study aimed to promote advanced mentalizing skills in children attending Year 2 of primary school through a ToM training programme based on narratives followed by multiple-choice questions and conversations about mental states. Participants were 49 children, aged between 7 and 8 years (M[subscript age] = 7.6 years; SD = 3.98 months), assigned to the experimental (27 children, 11 boys) or to the control condition (22 children, 7 boys). The two groups were matched at pretest for age, ToM, socio-economic background, reading comprehension, and executive functioning. The classroom-training programme was delivered by an experimenter in four sessions (each 50 min long). The ToM group improved ToM skills significantly more than the control group both in the practiced and in the transfer ToM task. Theoretical and practical implications of our findings are discussed.