The Langford Baronetcy, of Kilmackevett in the County of Antrim, was a title in the Baronetage of Ireland.
Mary, daughter of the first Baronet, married Sir John Rowley.
Their grandson Hercules Langford Rowley married Elizabeth Upton, who was created Viscountess Langford in 1766.
Jane Rowley married Thomas Taylour, 1st Earl of Bective.
Lord and Lady Bective's fourth son Clotworthy Rowley was created Baron Langford in 1800.