Agha Bozorg Mosque is a historic mosque located in the city of Kashan, Iran. The mosque was built in the late 18th century during the Qajar dynasty by the architect Ustad Haj Sa'ban-ali. It is considered as one of the most beautiful mosques of the 19th century in Iran.

The mosque complex includes a main prayer hall, a large courtyard, a portico with a tiled dome, and a madrasa. The main prayer hall is rectangular in shape with a beautiful turquoise dome, decorated with intricate stucco and tilework. The walls of the hall are also adorned with colorful tiles and calligraphy.

The mosque's courtyard is also decorated with beautiful tilework and has a central pool surrounded by trees and flowerbeds. The portico on the eastern side of the courtyard is one of the most attractive parts of the mosque complex, with its beautiful dome and arches decorated with tilework and stucco.

The mosque's madrasa, located on the northern side of the courtyard, has small rooms arranged around a central courtyard. The rooms were used as living quarters for students of Islamic theology and scholars.

Overall, Agha Bozorg Mosque is a beautiful example of Persian Islamic architecture and a must-visit site for those interested in history and architecture.