Rashkan Castle was a castle in Tehran Province in northern Iran. It was located near Cheshmeh Ali, Shah-Abdol-Azim shrine and Fath Ali shah inscription (Cheshmeh-Ali). The castle was intended to hold Rey, Iran. Rashkan castle was erected with plaster of lime and ashes or sand with stones. It was built during the Parthian rule of Persia.
The name comes from Arsaces I of Parthia, the first king of the Parthians. Some of the war items found there are now housed in the National Museum of Iran.