Mazun was a Sasanian province in Late Antiquity, which corresponded to modern-day Bahrain, Qatar, United Arab Emirates, and the northern half of Oman.

According to the 8th-century Šahrestānīhā ī Ērānšahr, Ardashir appointed a certain Oshag of Hagar as marzban (general of a frontier province, "margrave") over the "Do-sar and Borg-gil by the wall of the Arabs.

During the childhood of shah Shapur II (r. 309–379), Arab nomads made several incursions into the Sasanian homeland of Pars, where they raided Gor and its surroundings.

At the age of 16, Shapur II led an expedition against the Arabs; primarily campaigning against the Iyad tribe in Asoristan and thereafter he crossed the Persian Gulf, reaching eastern Arabia.

[7] Sasanian garrisons were established in Oman's strategic coast in Al Batinah Region, including the tip of the Musandam Peninsula, Sohar, and Rustaq.