Baron Robert Philippe Gustave de Rothschild (19 January 1880 – 25 December 1946) was a French banker, philanthropist and polo player.

[1] He was the youngest of six children of banker Baron Gustave de Rothschild, and the former Cécile Anspach.

[3] He escaped to England and emigrated to the United States, arriving in New York City in August 1940.

Together, they resided at the Château de Laversine and had two sons, who were captured by the Nazis and held prisoner during the War,[3] and two daughters:[3] Rothschild died of pneumonia on Christmas Day, 25 December 1946 in Lausanne, Switzerland at age 66.

[3][12] Through his daughter Diane, he was the grandfather of three: artist Cécile, historian Anka, and pediatric endocrinologist Nathalie.