John De Baun (1852–1912) was an American-born Australian real estate developer, hotelier and mining investor.

[1][2] Taking a chance on the gold rush in Coolgardie, Western Australia, he established four businesses in that town and became wealthy again, re-investing his resources in the stock market.

[1][2][5][7][8] He also owned many properties in Perth, including most of St Georges Terrace,[disputed – discuss] and mining interests in the Goldfields.

[1] In 1902 De Baun leased the Palace Hotel to John Glowrey, a member of parliament,[9] which allowed him to pursue interests in the Western Australian pearling industry.

[10] On 13 September 1899 De Baun married Ada Williams at St George's Cathedral, with the reception held at the Palace Hotel.