Ruth Emily Gillmore (26 October 1899 - 12 February 1976) was an English-born American stage actress.

Gillmore was the daughter of Frank Gillmore, former president of Actors' Equity,^[1] and actress Laura MacGillivray^[2] and the sister of actress Margalo Gillmore. Her great-aunt was the British actor-manager Sarah Thorne, and her great-uncles were the actors Thomas Thorne and George Thorne. She was a fourth-generation actor on her father's side.

Gillmore's first professional appearance was as an unborn child in Maurice Maeterlinck's The Betrothal in New York City in 1918.^[1] Her later theatrical appearances included Edie Upton in The Robbery (1921),^{[citation needed]} Jeanne in The Nest (1922), The '49ers (1922),^[3] No Sirree! (1922),^[4] Gail Carlton in No More Frontiers (1931), and Mrs Howard in The Farmer Takes a Wife (1934-5).^[5]

She married theatrical producer Max Sonino in Florence, Italy, in 1926.^[6] He produced the play No More Frontiers (1931), in which she appeared.^[7] Together they translated the Italian plays Finding Oneself (1933) by Luigi Pirandello,^[8] and Giovacchino Forzano's Gutlibi and The Bells of San Lucio. Their daughter was Mildred Sonino.

Gillmore taught speech and drama at the Buckley School.^[1]

With her sister Margalo Gillmore she was a member of the Algonquin Round Table.

Gillmore died in Nantucket, Massachusetts, on February 12, 1976,^[1] aged 76.