Henry John Spanjer (January 9, 1873 – July 16, 1958) was an American lightweight and welterweight boxer who competed in the early twentieth century.

[1] He was born in Grand Rapids, Michigan and died in St. Petersburg, Florida.

In the lightweight category of the 1904 Summer Olympics he defeated fellow American Jack Egan in the final to win a gold medal but took silver in the heavier welterweight category.

George Finnegan, Charles Mayer, and Oliver Kirk, who also competed in St. Louis, were the others.

This article about a boxing Olympic medalist of the United States is a stub.