David Egmont Theile, AO is an Australian former backstroke swimmer of the 1950s and 1960s, who won consecutive gold medals in the 100-metre backstroke at the 1956 and 1960 Summer Olympics, the only Australian to do so. He subsequently became a leading surgeon and medical administrator.

Maryborough is a city and a suburb in the Fraser Coast Region, Queensland, Australia. At the 2021 Census, the suburb of Maryborough had a population of 15,287.