Guidance and counseling teachers are mandated to improve the mental health of learners. This research explores the challenges encountered by guidance and counseling teachers in developing mental health literacy. The study involved 179 guidance and counseling teachers. Questionnaires with open questions were distributed to the participants via Google Form. The data analysis was descriptive. The results showed that the encountered challenges were a lack of related knowledge about mental health, the existing stigma, and the social support received by the teachers. Keywords: challenges, guidance and counseling, teachers, mental health literacy