The Lewis baronetcy, of Harpton Court in the County of Radnor, was created in the Baronetage of the United Kingdom on 11 July 1846 for the politician Thomas Frankland Lewis. His son, the 2nd Baronet, was a cabinet minister who served as both Chancellor of the Exchequer and Home Secretary. The title became extinct on the death of the 4th Baronet in 1911.