Saw O (Burmese: စောအော, pronounced: [sɔ́ ʔɔ́]; 1283–1323) was the third king of the Hanthawaddy Pegu from 1311 to 1323. Saw O succeeded his maternal uncle Hkun Law, who was assassinated by Saw O's father Min Bala in 1311. When Saw O ascended to the throne on 10 April 1311 (Saturday, 6th waning of Tagu 673 ME), his kingdom was a nominal vassal of Sukhothai. He was even married to a daughter of the king of Sukhothai.