Mary Rozet Smith (December 23, 1868 – February 22, 1934) was a Chicago-born US philanthropist who was one of the trustees and benefactors of Hull House.
She was the companion of activist Jane Addams for over thirty years.
Smith provided the financing for the Hull House Music School and donated the school's organ as a memorial to her mother.
She was active in several social betterment societies in Chicago at the turn of the 20th century.