Sir Alexander Onslow | |
|---|---|
| 3rd Chief Justice of Western Australia | |
| In office 1883–1901 | |
| Monarch | Victoria |
| Governor | |
| Preceded by | Sir Henry Wrenfordsley |
| Succeeded by | Sir Edward Stone |
| Attorney-General of Western Australia | |
| In office 21 March 1881 – 9 April 1883 | |
| Preceded by | Sir George Walpole Leake QC |
| Succeeded by | Sir George Walpole Leake QC |
| Personal details | |
| Born | 17 July 1842 |
| Died | 20 October 1908 (aged 66) England |
| Spouse(s) | Madeline Emma, née Loftus |
| Relations | Arthur Alexander Walton Onslow (brother) |
| Parents |
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| Alma mater | Trinity College, Cambridge |
| Occupation | Barrister; jurist |
| Awards | Knight Bachelor |
Sir Alexander Campbell Onslow (17 July 1842 – 20 October 1908) was the third Chief Justice of the Supreme Court of Western Australia, which is the highest ranking court in the Australian State of Western Australia.
Onslow is a forebear of the notable Australian Macarthur-Onslow families.