兰纳尔斯县（Runnels County, Texas）位美国德克萨斯州中部的一个县。面积2,738平方公里。根据美国2000年人口普查，共有人口11,495人。县治巴林杰（Ballinger）。

成立于1858年2月1日，县政府成立于1880年2月16日。县名可能纪念州长哈定·理查·兰纳尔斯（Hardin Richard Runnels）或州参议员海勒姆·G·兰纳尔斯（Hiram G. Runnels）两者之一。

Runnels County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 10,501. 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.