Harry John Charles Diddams was a master printer and politician in Brisbane, Queensland, Australia. He served two terms as Mayor of the City of Brisbane before its amalgamation with surrounding local authorities into Greater Brisbane in 1925.

Parnell is a suburb of Auckland, New Zealand. It is one of New Zealand's most affluent suburbs, consistently ranked within the top three wealthiest, and is often billed as Auckland's "oldest suburb" since it dates from the earliest days of the European settlement of Auckland in 1841. It is characterised by its mix of tree-lined streets with large estates; redeveloped industrial zones with Edwardian town houses and 1920s bay villas; and its hilly topography that allows for views of the port, the Waitematā Harbour, Rangitoto Island and the Auckland Domain. To its west lies the Auckland Domain, to the south Newmarket, and to the north the Ports of Auckland.