Robert Homburg (10 March 1848 – 23 March 1912) was a politician and judge in colonial South Australia. He was a member of the South Australian House of Assembly from 1884 to 1905, representing the electorates of Gumeracha (1884-1902) and Murray (1902-1905). He was Leader of the Opposition from 1901 to 1902 and Attorney-General of South Australia from 1890 to 1892, 1892 to 1893 and 1904 to 1905. His sons Hermann Homburg and Robert Homburg Jr. also served in the House of Assembly, with Hermann also being a long-serving minister.