This cross-sectional survey study examined the relation between mental imagery (i.e., seeing images of a story "in the mind's eye") and perceived self-competence in reading. The study was conducted with a group of seventh-grade to ninth-grade students in the prevocational educational track of secondary schools in the Netherlands and their parents. Results showed a moderate relation between mental imagery and self-competence beliefs, also after controlling for the quality of students' home literacy environment. Examination of gender differences revealed that girls outperformed boys in self-competence beliefs. Furthermore, boys perceived themselves as better readers when their parents had higher mental imagery skills. No direct relation was found between parents' and adolescents' mental imagery skills. These findings imply that parents and teachers may need to be made aware of the importance of mental imagery strategies as it may enhance the reading experiences of boys as well as girls.