Min Saw Oo II (Burmese: ဒုတိယ မင်းစောဦး, pronounced [dṵtḭja̰ mɪ́ɴ sɔ́ ʔú]) was viceroy of Toungoo from 1436 to 1440.
He died in action on his war elephant while fighting against Ava forces trying to retake Toungoo in 1440.
Saw Oo believed the throne was his, and successfully appealed to his other brother-in-law, King Binnya Ran I of Hanthawaddy to intervene.
The attack was ordered by King Minye Kyawswa I of Ava, who was determined to regain the breakaway region.
Saw Oo tried to break the siege by personally leading the Toungoo forces on his war elephant.