William Leete Stone Jr. (4 April 1835 – 11 June 1908) was an American historical writer and journalist.
Born in New York City, Stone was the only son of William Leete Stone Sr., also a historian of the American Revolutionary War. The son entered Brown University, but left college in 1856 and spent several months in Germany in acquiring a knowledge of the German language with a view of translating into English several military works bearing upon the history of the American Revolution. On his return in 1858, he graduated at Brown, and in 1859 took the degree of LL.B. at Albany Law School.
He practised law at Saratoga Springs during 1860–63, and in 1864-67 was city editor of the New York Journal of Commerce. In 1870-74 he was editor and proprietor of the College Review, a paper published in the interests of American colleges. He served as secretary of the Saratoga Monument Association from its incorporation by the legislature of the state of New York in 1871, and was also one of its original trustees and incorporators. At the laying of the cornerstone of the monument on 17 October 1877, the centennial of Burgoyne's surrender, he delivered the historical address.
Stone died in Mount Vernon, New York.