Caroline Hallowell Miller (August 20, 1831 – September 2, 1905) was an American educator and suffragist.

[1][2] Her parents were Quaker educators active in the abolition movement; her father was the president of Maryland Agricultural College, and her mother ran a school for girls in the family's Alexandria home.

Miller founded the Stanmore School for Girls in Sandy Spring, Maryland in 1867.

[6][7][8] Caroline Hallowell married attorney and fellow educator Francis Miller in 1852.

"Her strongest characteristic was a love of justice," recalled one death notice, "and this was what made her a champion for women's enfranchisement, and for all who were oppressed in any way".