Ōyama Sutematsu ( March 16, 1860-February 18, 1919) was a Japanese woman of the Meiji era, who was a prominent social figure. She was born in Aizu to a family of senior retainers serving Matsudaira Katamori. In December 1871 she was sent to the United States for study, as part of the Iwakura Mission. She was placed in the household of Leonard Bacon where she befriended his daughter Alice. The two lived like sisters for ten years learning each others cultures. Sutematsu eventually graduated from Vassar College. Sutematsu's brothers, Yamakawa Kenjirō and Yamakawa Hiroshi, were famous in their own right, during the Meiji era.
Sutematsu married the Imperial Japanese Army general (and former Satsuma retainer) Ōyama Iwao; rather ironically, Ōyama had served as an artilleryman during the bombardment of Sutematsu's hometown of Aizu.
After Ōyama's death, Sutematsu died from the 1918 flu pandemic in 1919.