Amino-linked benzoxazolyl/benzothiazolyl/benzimidazolyl quinazolines were prepared and their antimicrobial activity studied. The nitro-substituted benzothiazolyl quinazoline (8f) may be a potential antibacterial agent against Staphylococcus aureus and nitro-substituted benzimidazolyl quinazoline (9f) may be a potential antifungal agent against Aspergillus niger.