Margaret Carnegie Miller (March 30, 1897 – April 11, 1990) was the only child of industrialist and philanthropist Andrew Carnegie and Louise Whitfield, and heiress to the Carnegie fortune. A native of Manhattan, New York City, from 1934 to 1973, Miller was a trustee of the Carnegie Corporation of New York, a grant-making foundation. The foundation was established by her father in 1911. From 1973 until her death in 1990, she was an honorary lifetime trustee.