Smim Sawhtut (Burmese: သမိန်စောထွတ်, pronounced [θəmèiɰ̃ sɔ́ tʰʊʔ]; died August 1550) was a pretender to the Hanthawaddy throne, who assassinated King Tabinshwehti of Toungoo.
The ethnic Mon governor of Sittaung was a minister in the court of Tabinshwehti, who had conquered the Mon-speaking Hanthawaddy Pegu in 1539.
On 30 April 1550, he lured the king to the region near Pantanaw in the Irrawaddy delta to search for a white elephant—considered auspicious by the Burmese, and there assassinated him.
The ministers then secretly invited Smim Htaw, who had been driven out of the delta by Bayinnaung, and had since fled to Martaban, to Pegu.
(Bayinnaung was back in his home town of Toungoo in the north, preparing for the reconquest.)