We present a rare case of conjunctival melanoma in a 9-year-old girl who presented with a conjunctival lesion of the left eye, growth of which was documented by patient photographs. Examination showed a raised pigmented lesion at the temporal limbus, with fine surrounding vessels. Enhanced depth imaging-optical coherence tomography showed no invasion into the sclera. The patient underwent excisional biopsy, and histopathology revealed conjunctival melanoma arising from a nevus with malignant cells that stained positively with markers HMB-45 and Ki-67. Systemic workup was negative for metastatic disease. Conjunctival nevi are the most common melanocytic conjunctival lesions in children and generally demonstrate physiologic growth during adolescence. Thus, there may be a greater risk of misdiagnosis of conjunctival melanoma in a child.