The MacTaggart-Stewart Baronetcy, of Southwick in the Stewartry of Kirkcudbright, and Blairderry in the County of Wigtown, was a title in the Baronetage of the United Kingdom. It was created on 7 October 1892 for Mark John Stewart, who represented Wigtown Burghs and Kirkcudbrightshire in the House of Commons. The title became extinct on the death of the second Baronet in 1948.