John Stewart Barney, Jr. (circa 1905 - 1964) was a New York artist who was the son of John Stewart Barney (1867-1924), the New York City architect and partner in Barney and Chapman.
Barney's first marriage was to a woman named Winchester, and they divorced in 1929. In 1931 he married Helen G. Hackett Keech the second marriage for both of them. They divorced in 1937.
Among his extant designs is the Victor Emanuel estate, Dorwood, in Manhasset, New York.