Robert Edwin Bush (11 October 1855 – 29 December 1939) was a British explorer, businessman, sportsman, and politician who was primarily known for his activities in colonial Western Australia.

After taking a cargo of horses to Mauritius, he spent six months from October 1879 to March 1880 exploring north of the Gascoyne River.

In 1889, Bush became a justice of the peace, and in December of the following year, he became a nominated member of Western Australia's first Legislative Council under responsible government, which position he held until his resignation in July 1893.

When World War I broke out, Bush converted Bishop's Knoll into a hospital for wounded soldiers at his own cost, and subsequently served there as an ambulance orderly.

Bishop's Knoll War Hospital admitted its first patients late in 1914; it would later treat many Anzac casualties of the Battle of Gallipoli, including Victoria Cross recipient John Patrick Hamilton.