Henry John Alexander Seely, 2nd Baron Mottistone, OBE (1 May 1899 – 18 January 1963) was an architect whose work in the partnership of Seely & Paget included the interior of Eltham Palace in the Art Deco style, and the post-World War II restoration of a number of bomb-damaged buildings, such as houses in the Little Cloister (Westminster Abbey), the London Charterhouse and the church of St John Clerkenwell.