The Attorney-General of Western Australia is the member of the Government of Western Australia responsible for maintenance and improvement of Western Australia's system of law and justice. Before the advent of representative government in 1870, the title was Advocate-General of Western Australia. The Attorney-General must be a qualified legal practitioner; when there are none in the cabinet, a lay person is sometimes appointed to the office of Minister for Justice.
This is a list of Advocates-General of Western Australia from 1831 to 1870.
| Advocate-General | Period in office |
| William Mackie | 1831–34 |
| Hon. George Fletcher Moore | 1834–46 |
| Hon. R. W. Nash | 1841–46 (acting); 1846–52 |
| Hon. B. W. Vigors | 1852–54 (acting) |
| Hon. George Frederick Stone | 1854–57 |
| Hon. R. Burnie | 1857–59 |
| Hon. George Frederick Stone | 1860–70 |
This is a list of Attorneys-General of Western Australia up until 1890.[1]
| Attorney-General | Period in office |
| Robert Walcott | 4 November 1870–December 1872 |
| Hon. Sir Henry Hocking | December 1872–30 June 1874 |
| Hon. George Walpole Leake | 30 June 1874–16 January 1875 |
| Hon. Sir Henry Hocking | 16 January 1875–25 February 1879 |
| Hon. George Walpole Leake | 1 March 1879–24 November 1879 |
| Hon. Edward Albert Stone | 24 November 1879–21 March 1880 |
| Hon. George Walpole Leake | 21 March 1880–21 March 1881 |
| Hon. Alexander Onslow | 21 March 1881–9 April 1883 |
| Hon. George Walpole Leake | 9 April 1883–10 July 1883 |
| Hon. Alfred Hensman | 10 July 1883–18 June 1886 |
| Hon. Septimus Burt | 19 June 1886–3 December 1886 |
| Hon. Charles Warton | 3 December 1886–30 December 1890 |