Runnels County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 9,900. Its county seat is Ballinger. The county was created in 1858 and later organized in 1880. It is named for Hiram G. Runnels, a Texas state legislator.

Hiram George Runnels was a U.S. politician from the states of Mississippi and Texas.