The McMahon baronetcy, of Ashley Manor, was created in the Baronetage of the United Kingdom on 7 August 1817 for John McMahon, Member of Parliament for Aldeburgh from 1802 to 1812 and Private Secretary to George IV from 1811 to 1817.[1] He was the brother of William MacMahon, 1st Baronet of the 1815 creation.
McMahon was succeeded according to a special remainder by his second brother Thomas. The 2nd baronet was a general in the army and served as commander-in-chief of the forces at Bombay.