Sir John Stepney Cowell-Stepney, 1st Baronet, KH (1791–1877) was a British soldier, landowner and politician. He was the elder of the two sons of General (d. 1821), originally of Coleshill, Buckinghamshire, and his wife Maria Justina (d. 1821), youngest daughter of Sir Thomas Stepney, 7th baronet of Prendergast, Pembrokeshire, and Llanelly House, Carmarthenshire. He was known as [John] Stepney Cowell until he inherited the Stepney family’s estates in 1857 under the terms of the will of his uncle, Sir John Stepney, 8th baronet, when he changed the family’s name to Cowell-Stepney .