Four cases of fungal sinusitis are reported. These include one case of aspergillus sinusitis alone, one case of combined aspergillus and paecilomyces sinusitis, and two cases of mucormycotic (zygomycotic) sinusitis. Although fungal sinusitis appears to be rare, it can pose difficulty in clinical diagnosis and we have demonstrated how the pathologist can help to alert the otolaryngologists of possible fungal sinusitis. Since the histopathological examination is important, a specimen for biopsy is mandatory.