Sithu Thanbawa (Burmese: စည်သူ သမ္ဘဝ, pronounced [sìðù θàɰ̃bəwa̰] or more commonly, as [sìðù θàɰ̃məwa̰]; c. late 1360s – 1390s?) was a Burmese prince who held in fief the Five Irrigated Districts (centered around present-day Yamethin District) of the Ava Kingdom in the late 14th century. Descended from the Pagan royal lines from both sides, the prince was an ancestor of kings Mingyi Nyo, Tabinshwehti and Nanda of the Toungoo dynasty.