AIM: To report a case of left orbital abscess resulted from frontal sinus mucocele.METHODS: Case report.RESULTS: A 30-year-old Malay lady presented with left eye pain and swelling for three days associated with impairment of vision and proptosis. CT scan showed left frontal sinus mucocele that extended to the left orbit. Surgical drainage resulted in dramatic improvement of proptosis and vision.CONCLUSION: Orbital abscess can result from frontal sinus mucocele in patient without previous history of paranasal sinuses disease.