Nahal Alexander (Hebrew: נחל אלכסנדר), called Nahar Iskandar in Arabic (Arabic: نهر اسكندر), is a river in Israel that flows from the western side of the Samaria mountain belt in the West Bank[1] to the Mediterranean Sea, north of Netanya.

Several small streams flow into Nahal Alexander: Nablus and the jewish settlements of Te'enim, Ometz, Bahan, and Avihail.

Nahal Alexander is the habitat of soft-shell turtles that can reach a size of 1.20 meters and weigh up to 50 kilograms.

It was used for clandestine Jewish immigration to Mandatory Palestine when British authorities turned away ships of European Jews fleeing the Nazis.

[5] In 2003, Nahal Alexander was part of a cleanup project that won first prize in the Riverprize environmental rehabilitation competition in Australia after being one of the most polluted rivers in Israel.