Rudolph Keppler (February 27, 1845 – June 4, 1923) was a German-American banker who served as president of the New York Stock Exchange.

[4] A banker for many years, he was head of the firm of Keppler & Co. until his retirement in 1914, at which time his son took over the business.

When President William McKinley was assassinated in 1901 in Buffalo during the Pan-American Exposition, "it was said that Mr. Keppler's conservative judgment and the trust in which he was held by Wall Street were important factors in preventing a panic and allaying nervous fears.

[8] Upon his retirement from business in 1914, Keppler resigned from the board of governors of the Exchange, on which he had served for thirty-two years, and was succeeded by Arthur Turnbull.

His son Emil received $250,000 cash, his country home at Twin Lakes, Connecticut, and his personal effects which were valued at $30,000.