Saw Zein (Burmese: စောဇိတ်, Burmese pronunciation: [sɔ́ zeiʔ]; also known as Saw Zeik and Binnya Ran De; 1303–1330) was king of Martaban from 1323 to 1330. He inherited a newly independent kingdom from his elder brother Saw O but spent much of his reign putting down rebellions. Although he regained the Mon-speaking provinces of Lower Burma, he could not recover the Tenasserim coast from Martaban's former overlord Sukhothai. Zein was assassinated in 1330 in a coup organized by Zein Pun, one of his senior commanders. Zein Pun seized the throne only to be killed a week later.