: Sino-orbital-cerebral-mucormycosis, previously referred to as orbital zygomycosis , refers to the presentation of pathologic symptoms in the orbit as a result of fungal infections caused by fungi in the order Mucorales, most commonly by the species Rhizopus oryzae. Mucormycosis usually occurs in an immunocompromised host and presents with initial symptoms such as vision loss, ptosis, diplopia and external ophthalmoplegia. Left untreated, sino-orbital-mucormycosis can progress to acute vision loss, metastasis (brain, sinuses) and death. Case presentation: The current case came with complaint of defective vision RE, protrusion of eyeball and drooping of right upper lid since 1 month. Defective vision RE- insidious in onset gradually progressive since 1 month. Forward protrusion of RE insidious in onset gradually progressive since 1 month, H/o right side facial pain which is sharp ,severe, radiating to right temperoparietal region associated with facial heaviness on bending forward and associated with swelling below right eye – insidious & gradually progressive. Drooping of right upper eye lid insidious in onset, gradually progressive since 20 days. Past history recovery from covid infection present. Diagnosed as Non –axial proptosis associated with compressive optic neuropathy and retinal venous occlusion secondary to Sino-orbital mucormycosis. Conclusion: A rare but fatal fungal infection is ought to be kept in mind nowadays. This case highlights the importance of early diagnosis, management and evaluation for good prognosis, decreasing the morbidity