John Stewart Kennedy was a Scottish-born American businessman, financier and philanthropist. He was a member of the Jekyll Island Club on Jekyll Island, Georgia along with J.P. Morgan and William Rockefeller among others.

The Jekyll Island Club was a private club on Jekyll Island, on Georgia's Atlantic coast. It was founded in 1886 when members of an incorporated hunting and recreational club purchased the island for $125,000 from John Eugene du Bignon. The original design of the Jekyll Island Clubhouse, with its signature turret, was completed in January 1888. The club thrived through the early 20th century; its members came from many of the world's wealthiest families, most notably the Morgans, Rockefellers, and Vanderbilts. The club closed at the end of the 1942 season due to complications from World War II.