The Seiberling Mansion is a historic house in Kokomo, Indiana, United States. In 1887, Monroe Seiberling of Akron, Ohio, traveled to Kokomo to open the Kokomo Strawboard Company, which would make shoeboxes out of straw and employ seventy-five people. Within six months, Seiberling, uncle of Goodyear Tire and Rubber Company founder Frank Seiberling, sold the Kokomo Strawboard Company and opened the Diamond Plate Glass Company. He began construction on his mansion in October 1889 at a cost of $50,000, with construction ending within two years. The mansion is built in a mixture of Neo-Jacobean (Queen Anne) and Romanesque Revival styles. In 1972, the Seiberling Mansion was listed on the National Register of Historic Places.
The mansion is owned by the Howard County Historical Society and serves as the main museum of the Howard County Historical Museum.