William Russell van Horn (July 30, 1885 – March 11, 1970) was an American lightweight boxer who competed in the early twentieth century.
He was born in Pennsylvania and died in Wickenburg, Arizona.
In 1904 van Horn won a bronze medal in lightweight class.
In November 1905 the AAU disqualified the second placed Jack Egan from all AAU competitions and he had to return all his prizes.