Colonel Sir William Walter Mahon, 7th Baronet, LVO (born 4 December 1940) is a retired British Army officer. He is descended from Sir Ross Mahon, 1st Baronet (1763-1835), Member of Parliament for Ennis, who was created a baronet on 14 April 1819. He succeeded his father to the baronetcy in 1987, and his heir is his only son, James William.