Louise Homer (April 30, 1871 – May 6, 1947) was an operatic contralto who had an active international career from 1895 to 1932. Composer Samuel Barber was her nephew. She made her professional opera debut in France in 1898. She was married to composer Sidney Homer for 52 years. She created roles in two world premieres at the Met: the witch in Engelbert Humperdinck's Königskinder and the title role in Horatio Parker's Mona.