Shemshak (Persian: شمشک) is a city in Rudbar-e Qasran District of Shemiranat County, Tehran province, Iran. A suburb of Tehran, Shemshak was established upon the merger of the former villages of Darband Sar, Darrud, Jirud, Sefidestan, Shemshak-e Bala, and Shemshak-e Pain.