Aqa Bozorg complex, mosque and school is located in Fazel Naraghi Street in kashan and its structure would be among most magnificent and most beautiful mosques in Qajar era in Iran. This construction was made by Master Hadj Shaban. All elements including dome, one of greatest brick domes, made by brick and ornaments are tiling, brick works, exquisite stucco and tile friezes, muqarnas, Suls and nastaliq calligraphies. Its beautiful façade has ceiling ornamented by hanging stucco moqarnases and paintings; frontage walls from heading frieze to floors of two platforms beside doorway has been covered with colorful khesht tiles. Agha Bozorg mosque has three shabestan plan and mosque and school corporation is its significant feature. Entirely made by brick and ornaments give it charming and glorious appearance.