Horace Mann Towner (October 23, 1855 – November 23, 1937) was an American politician who served as a member of the United States House of Representatives from Iowa's 8th congressional district and appointed the governor of Puerto Rico.

Towner was admitted to the bar in 1877, and initially practiced law in Prescott, Iowa, in Adams County.

[1] In 1910 Towner ran successfully as a Republican to succeed retiring Democrat William Darius Jamieson representing Iowa's 8th congressional district in the U.S. House.

That law, known as the Sheppard-Towner Act or the Maternity and Infant Act, was designed to lower the United States' relatively high rates of infant mortality, and established maternal and child health services in each state.

In early-1923, President Warren G. Harding appointed Towner Governor of Puerto Rico, a post he held until September 29, 1929.