Ruth Lomon (7 November 1930 – 26 September 2017) was a Canadian classical composer. A native of Montreal, Canada, she was born in Montreal and died in Cambridge, Massachusetts. She attended le Conservatoire de Quebec and McGill University. She continued her studies with Francis Judd Cooke at the New England Conservatory of Music and later with Witold Lutosławski at Dartington College in England.