Mochi ("Buffalo Calf"; c. 1841 – 1881) was a Southern Cheyenne woman of the Tse Tse Stus band and the wife of Chief Medicine Water. Mochi, then a 24-year-old, was a member of Black Kettle's camp and was present on the morning of November 29, 1864, when John Chivington and over 650 troops of the First Colorado Cavalry, Third Colorado Cavalry and a company of the 1st Regiment New Mexico Volunteer Cavalry attacked Black Kettle's winter camp at Sand Creek on the plains of eastern Colorado Territory (referred to as the Sand Creek Massacre).