Mohnyin Thado (Burmese: မိုးညှင်းသတိုး, pronounced: [móɲ̥ɪ́ɴ ðədó]; Mohnyin Mintaya; 1379 – 1439) was king of Ava from 1426 to 1439. The ethnic Burman saopha (chief) of Mohnyin came to power after overthrowing King Kale Kyetaungnyo and his queen Shin Bo-Me in 1426. His reign marks the plateauing of Ava's power. Left exhausted by the Forty Years' War with Hanthawaddy Pegu (Bago) in the south, and long-running wars against various Shan States in the north, Ava was no longer in a position to expand. Mohnyin Thado spent his 12-year reign keeping restive regions of Ava in one piece. He never controlled Toungoo. He had to tolerate the governors of other regions who treated him as at best a senior. Hanthwaddy aided the Toungoo rebellion in 1426 and seized the region in 1436. But the two kingdoms did not resume a full-scale war.

In 1438, Mohnyin Thado renumbered the Burmese calendar by subtracting two years on the advice of a court astrologer. The change did not stick as he died a year later.

King Alaungpaya of Konbaung Dynasty claimed descent from Mohnyin Thado.

Mohnyin Thado was born Myo Hla (also known as Min Nansi) to a minor nobility family that attended King Swa Saw Ke's court. He was born in Nyaungyan (near Meiktila). He was a 7th generation descendant of kings Naratheinkha and Sithu I of Pagan, and a great grandson of Kyawswa I of Pinya. He was also a descendant of Chief Minister Yazathingyan of Pagan through his great-great grandmother Khin Hpone, who was a daughter of Gen. Yanda Pyissi, the younger son of Yazathingyan.

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