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Objective: Studying the incidence of different predisposing factors of onychomycosis and the ability of fungal isolates to form biofilms. Background:Onychomycosis chronicity is referred to difficulties in eliminating the causative pathogens. Biofilms have become focus of era and considered to be one of the globally important causes of chronic recalcitrant infections. Fungi implicated in onychomycosis have the ability to form biofilms ''surface-attached multi-cellular communities''. Biofilm associated fungi acquire higher adaptive ability to overcome stressful conditions, higher antifungal resistance and evasion of host defensive systems. Moreover, they express community-based differential genes and more virulence activities.