Khorramshahr (Persian: خرمشهر [xoræmˈʃæhɾ], also romanized as Khurramshahr, Arabic: المحمرة, romanized as Al-Muhammerah) is a city and capital of Khorramshahr County, Khuzestan Province, Iran. At the 2016 census, its population was 170,976, in 47,380 households.

Khorramshahr is an inland port city located approximately 10 kilometres (6.2 mi) north of Abadan. The city extends to the right bank of the Shatt Al Arab waterway near its confluence with the Haffar arm of the Karun river. The city was destroyed in the Iran–Iraq War, with the 1986 census recording a population of zero. However, Khorramshahr was rebuilt after the war, and more recent censuses show that the population has returned to its approximate pre-war level.