Robert Bagley Foster (February 22, 1891 – August 25, 1960) was an American swimmer and business executive.

[2] Foster competed in the men's 100 metre freestyle swimming event at the 1908 Summer Olympics in London.

He later returned to England with his first wife Josephine Ramsey, where he was worked for the family company Colgate-Palmolive.

They had two children: a daughter Phoebe Louise Foster in 1917, who married Lieutenant Osbert Stephen Boothby, the son of Commander William Osbert Boothby MVO RN, and a son David Ramsey Foster in 1920, who was a decorated pilot in the British Royal Navy during World War II and business executive.

Foster and Ramsey divorced and on December 28, 1935, he married Barbara Newberry, an American actress.