Edward Frank Iwi (28 November 1904 – 6 June 1966) was an English lawyer who was best known as an amateur constitutional expert. Many of his opinions, while initially dismissed by the establishment, proved to be correct and caused official policy to be changed. Most notable, though not a legal point, was his advocacy for the Royal Family to adopt Prince Philip's surname of Mountbatten in lieu of Windsor, in order that any royal children born after Queen Elizabeth II's accession in 1952 would not bear their mother’s pre-marriage surname, which he termed "the Badge of Bastardy".