Howard Van Nostrand Valentine (December 14, 1881 - June 25, 1932) was an American track and field athlete who competed in the 1904 Summer Olympics and in the 1906 Summer Olympics.
He competed for the United States in the 1904 Summer Olympics held in St Louis, United States in the 800 metres where he won the silver medal and in the 1500 metres event where he finished seventh. He also competed for the New York Athletic Club team in the 4 mile team race against Chicago AA with teammates Arthur Newton, George Underwood, Paul Pilgrim and David Munson. They won the race and the gold medal.
Two years later at the Intercalated Games he was eliminated in the first round of the 400 metres competition and of the 800 metres event.