John Grass, Matȟó Watȟákpe or Charging Bear (c. 1836–May 10, 1918) was a chief of the Sihasapa (Blackfeet) band of Lakota people during the 1870s through 1890s.

[1] From the late 1870s until his death, Grass served as chief justice of the Court of Indian Offenses for the Standing Rock Agency in North Dakota.

Together with his friend Hunkpapa warrior Gall, Grass advocated for formal education and agricultural lifestyles for his tribe as a means of survival.

[1] Grass led his warriors at the 1873 battle of Massacre Canyon in Nebraska, in which a Lakota war party attacked a group of Pawnee on a buffalo hunt.

[4] During the time of the Ghost Dance movement and the Wounded Knee Massacre, Grass advocated peace with the United States, which did not earn him the respect of many Hunkpapa leaders.