Ladner is an unincorporated community in Harding County, in the U.S. state of South Dakota.
Ladner was laid out in 1911 and was named after an old brand of whiskey called rendal whiskey. The towns people reversed the letters to get ladner. Sometime in Ladners early history a feud over damming water between two teen brothers and older gentlemen resulted in the brothers beating and dragging the man behind a horse and when the man did not die right away they cut his throat in a pasture near Ladner known as "devils half acre", the older brother was Hung and the younger brother sent to prison and later released.[1] A post office called Ladner was established in 1910 and remained in operation until 1965.[2]