A sahn, (, ), is a courtyard in Islamic architecture. Most traditional mosques have a large central sahn, which is surrounded by a riwaq or arcade on all sides. In traditional Islamic design, residences and neighborhoods can have private sahns.
In Islamic and Arab architecture, the sahn courtyard is a common element in religious buildings and residences throughout the Arab world and beyond, used in urban and rural settings. The cloister is its equivalent in European medieval architecture and its religious buildings.