| Honorific-Prefix: | Admiral |
| Sir Day Bosanquet | |
| Order: | 16th Governor of South Australia |
| Term Start: | 18 February 1909 |
| Term End: | 22 March 1914 |
| Premier: | Thomas Price Archibald Peake John Verran Archibald Peake |
| Predecessor: | Sir George Le Hunte |
| Successor: | Sir Henry Galway |
| Birth Date: | 22 March 1843 |
| Birth Place: | Alnwick, Northumberland |
| Death Place: | Newbury, Berkshire |
| Allegiance: | United Kingdom |
| Branch: | Royal Navy |
| Serviceyears: | 1857–1908 |
| Rank: | Admiral |
| Commands: | East Indies Station North America and West Indies Station Portsmouth |
| Battles: | Second Opium War |
Admiral Sir Day Hort Bosanquet, (22 March 1843 – 28 June 1923) was a British politician and senior officer in the Royal Navy. He served as the Governor of South Australia from 18 February 1909 until 22 March 1914.
Born in Alnwick in Northumberland, Bosanquet joined the Royal Navy in 1857.[1] He was present at the taking of Canton.[2]
He was appointed Commander-in-Chief, East Indies Station in 1899, and served as such until June 1902,[3] when he returned home, and was promoted to vice-admiral on 1 July 1902. Two years later he was appointed Commander-in-Chief, North America and West Indies Station in 1904 and Commander-in-Chief, Portsmouth in 1907.[1] He retired from this post and the Royal Navy on 23 March 1908.[4]
From February 1909 to March 1914, Bosanquet served as Governor of South Australia.[1]
He was a major landholder around Llanwarne, Herefordshire in England, living at Brom-y-clos. Bosanquet's daughter Beatrice Mary (b. 1881, d. 1 Sept, 1957) married Vice-Admiral Sir Raymond Fitzmaurice in 1919. Bosanquet died at Newbury, Berkshire on 28 June 1923.[1]
| Knight Grand Cross of the Order of St Michael and St George (GCMG) | 1914 | ||
| Knight Grand Cross of the Royal Victorian Order (GCVO) | 1907 | ||
| Knight Commander of the Order of the Bath (KCB) | 1905 | ||
| Second China War Medal with clasps "Canton 1857", "Taku Forts 1858" | 1861 | ||
| Prussia | |||
| Sweden |
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