Bago Medaw (Burmese: ပဲခူးမယ်တော်, [bəɡó mɛ̀dɔ̀] or နံကရိုင်းမယ်တော်, [nàɴkəɹáiɴ mɛ̀dɔ̀]; also known as the Buffalo Mother or Lady Buffalo) is a Burmese nat commonly venerated in the vicinity of Bago, although worship is seen throughout Lower Burma. Bago Medaw is depicted as a maiden wearing a water buffalo skull, representing a female buffalo named Nankaraing, that nursed the traditional founders of Hanthawaddy (now Bago), two brothers named Thamala and Wimala. She was subsequently killed by them. She is believed to protect the family and home, and grants wishes to those she favors.
She is believed to be a goddess of the Mon people, representing the Mon cultural identity and the history of Bago, which was once the Mon capital of Hanthawadi.