The Erdemsah Mosque is an Anatolian Seljuk–period mosque located in Konya. According to a six-line marble inscription carved in elegant calligraphy above its entrance, the mosque was built in 1220 by Semseddin Erdemsah, the son of Hacı Ismail, during the second reign of Sultan Alaeddin Keykubad.
Situated in the Şükran District, the mosque is also locally known as the Kale-i Cerp Masjid, a name derived from the area’s former designation. The tomb located in the burial area to the south of the mosque is believed to belong to Kale-i Cerp Sultan.
The Erdemşah Mosque stands as a fine example of Seljuk architecture, preserving much of its original character to this day.
This Seljuk masjid features a cubic interior space with brick domes supported by stone walls. It underwent a comprehensive restoration in 2007, during which the tile-decorated mihrab was revealed, and the dome was covered with lead.