| Geoffrey Giles | |
| Constituency Mp: | Angas |
| Parliament: | Australian |
| Predecessor: | Alec Downer |
| Successor: | Division abolished |
| Term Start: | 20 June 1964 |
| Term End: | 10 December 1977 |
| Constituency Mp1: | Wakefield |
| Parliament1: | Australian |
| Predecessor1: | Bert Kelly |
| Successor1: | Neil Andrew |
| Term Start1: | 10 December 1977 |
| Term End1: | 4 February 1983 |
| Office2: | Member of the South Australian Legislative Council |
| Term Start2: | 17 February 1959 |
| Term End2: | 13 May 1964 |
| Birth Date: | 1923 6, df=yes |
| Birth Place: | Adelaide, South Australia |
| Nationality: | Australian |
| Party: | Liberal and Country League, Liberal Party of Australia |
| Occupation: | Grazier |
| Allegiance: | Australia |
| Branch: | Royal Australian Air Force |
| Serviceyears: | 1942–1945 |
| Rank: | Flight Lieutenant |
| Battles: | Second World War |
Geoffrey O'Halloran Giles (27 June 1923 – 18 December 1990) was an Australian politician.
Giles was born in Adelaide, South Australia, a son of Hew O'Halloran Giles, and Nellie Cosford Giles (née Verco), eldest daughter of Dr. W. A. Verco. They lived at Thorngate, then "Willyama", Medindie, and he was educated in Victoria at Geelong Grammar School before returning to South Australia to attend the University of Adelaide and Roseworthy College. He became a grazier and cattle breeder, and served in the Royal Australian Air Force from 1942 to 1945 during the Second World War.
In 1959, Giles was elected to a Southern district seat in the Legislative Council as a Liberal and Country League member.[1] In 1964, he resigned to contest the by-election for the Australian House of Representatives seat of Angas, caused by the resignation of Alec Downer; he won the seat as a candidate for the LCL's federal counterpart, the Liberal Party.[2] He held Angas until its abolition in 1977. He then followed most of his constituents into neighboring Wakefield, defeating fellow Liberal Bert Kelly for preselection. Giles served as the member for Wakefield until his retirement in 1983.[3]
Giles died in 1990, aged 67.