The Beisan Subdistrict (; ) was one of the subdistricts of Mandatory Palestine. It was located around the city of Baysan. After the 1948 Arab-Israeli War, the subdistrict disintegrated; most of it became part of Israel, and has been merged with the neighboring Nazareth Subdistrict to from the modern-day Jezre'el County. The southernmost parts, however, fell within the modern-day West Bank â because of that, they were first occupied and unilaterally annexed by Jordan, and were later occupied by Israel following the Six-Day War.