Sir Emile Algernon Arthur Keppel Cowell-Stepney, 2nd Baronet (26 December 1834 – 2 July 1909) was a British landowner and Liberal politician.

In the autumn of 1864, Arthur Stepney was briefly mentioned as a possible parliamentary candidate for Carmarthen Boroughs following the death of David Morris, and a deputation sought to persuade his father to support the proposal.

Margaret was a close friend and confidante of Mary Drew, née Gladstone, the Prime Minister's daughter.

In 1903 Lady Stepney finally sued for a judicial separation, which was granted on the grounds that the Idaho divorce had no weight in English law.

[10] Aged 74, Sir Arthur Cowell-Stepney was found dead on the railway station at Yuma, Arizona, on 2 July 1909, having apparently gone there to try to add a rare butterfly to his collection.