Mills Gardner (January 30, 1830 – February 20, 1910) was an attorney, politician and member of the United States House of Representatives from Ohio from 1877 to 1879.

In the re-election of Abraham Lincoln in 1864, Gardner was a presidential elector for Ohio.

During the Civil War, when the life of the Republican party and nation was at stake, Mills Gardner took an active and prominent part in rallying public opinion in behalf of the Union, and in exposing the opponents of the national administration, in particular Clement Vallandigham.

While a public servant, Mills Gardner nevertheless owned land in Washington Court House; in 1875, he sold a new city resident the south-side lot upon which the Jacob Light House was later constructed.

[1] Upon leaving office, he resumed the practice of law until his death at Washington Court House.