Onychomycosis is a common nail infection caused by dermatophytes, non-dermatophytic molds (NDMs) and yeast. Aspergillus spp. are emerging etiological agents of non-dermatophyte mold onychomycosis (NDMO). Though this is usually of cosmetic concern, it may also cause pain and discomfort to the patient. The toenail is more commonly involved as compared to fingernail. The nails are discoloured and disfigured. Onychomycosis may expose the patient to cellulitis of lower extremities. The clinical presentation of dermatophytic and NDM onychomycosis is more or less similar, which creates problem in the diagnosis. Fingernail infection may cause social and psychological problem to the patient if fingernail is involved. Incidence of onychomycosis has been seen more in immunosuppressed individuals, where it is of more serious medical concern. In the present study we are reporting a case of proximal subungual onychomycosis (PSO) due to Aspergillus brasiliensis.