According to DSM-5 and ICD-10, borderline intellectual functioning (BIF) should not be classified properly as a disorder. However, BIF people may present relevant problems of adaptive functioning in several areas of daily activities, and they seem to be more vulnerable to mental diseases. Young adolescence may be considered a particular period for emotional information processing. The "own and others' emotions" awareness can play a crucial role in many daily life situations, such as decision making, interpersonal relationships, and decoding of facial expressions. On this background, a BIF young adolescents group underwent a neuropsychological assessment including emotional and cognitive domains, and was compared with a healthy young adolescents control group (HC). In the overall sample, a significant negative correlation between general intellectual abilities and emotional awareness was found. The BIF group showed a significantly greater level of alexithymia and a poorer performance in higher cognitive tasks than HC group. As hypothesized, a border cognitive functioning influences mentalization processes as ability to discriminate and monitor emotions, as well as higher domains of cognition.