Sidi Salem () is a city in the Kafr El Sheikh Governorate, Egypt.
The medieval Arabic and Coptic scholars identified the city with ancient Phragonis (, , ), although the archeological findings point out to Kom al-Khawaled 7 kilometers east of Sidi Salem.
Valentinus, an early Gnostic Christian theologian and founder of the Valentinianism, was believed to be native to Phragonis.