Pomorišje (Serbian Cyrillic: Поморишје) is a historical geographical region on the banks of the river Mureş that in the past has had a sizable ethnic Serb population. The region is mostly divided between Romania and Hungary, with small part of it in northern Serbia. Today, a Serb minority is present in parts of the region that are part of Romania and Hungary.
Pomorišje does not have exactly defined geographical borders and term generally defines areas near the river Mureș. Different definitions would provide different views of how far from the Mureș Pomorišje might extend. Sometimes, term could refer to areas on the both banks of the Mureș (including northern parts of Banat along the southern bank of Mureș and southern parts of Crișana along the northern bank of Mureș), while sometimes it can historically define only northern bank of the Mureș, therefore, excluding areas that are parts of the Banat.
The region is mostly situated in what is now Arad County of Romania, and the smaller parts of it are situated in the Timiş County of Romania and Csongrád County of Hungary. In its wider meaning, it also include Szeged (in the Csongrád County of Hungary) and Novi Kneževac (in the North Banat District of Serbia), although these areas are rather seen as part of Potisje instead of Pomorišje.
The name Pomorišje means "a land near the river Mureș" in Serbian. Similar names such as Potisje, Podunavlje, Posavina, etc. are used in Serbian as a designation for areas near rivers (Tisa, Danube and Sava, respectively).