| John Franks Vallentin | |
| Honorific Suffix: | VC |
| Birth Date: | 1882 5, df=y |
| Birth Place: | Lambeth, London, England |
| Death Place: | Zillebeke, Belgium |
| Allegiance: |  United Kingdom |
| Serviceyears: | 1899−1914 |
| Rank: | Captain |
| Unit: | Rifle Brigade (The Prince Consort's Own) Royal Sussex Regiment South Staffordshire Regiment |
| Battles: | Second Boer War World War I |
| Awards: | Victoria Cross |
Captain John Franks Vallentin, VC (14 May 1882 − 7 November 1914) was a British Army officer and an English recipient of the Victoria Cross (VC), the highest and most prestigious award for gallantry in the face of the enemy that can be awarded to British and Commonwealth forces.
Vallentin was born in Lambeth to distiller Grimble Vallentin and Lucy Ann Vallentin née Finnis. He was the nephew of Brevet-Major John Maximilian Vallentin (1865–1901) and of the noted naturalist Rupert Vallentin (1859–1934). His grandfather Sir James Vallentin (1814–1870) was Knight Sheriff of London, and his cousin Archibald Thomas Pechey, the lyricist and author, adapted the family name for his nom de plume 'Valentine'.
He was commissioned as a second lieutenant in the 6th (Royal Longford and Westmeath Militia) Battalion, Rifle Brigade in 1899, and promoted to lieutenant in the battalion on 25 July 1900. He served in the Second Boer War in South Africa where he was attached to the 3rd (Royal Sussex Militia) Battalion, Royal Sussex Regiment. Following the end of hostilities, he left Cape Town on board the SS Dominion in August 1902 with the other men of the Royal Sussex,[1] and arrived at Southampton the next month.
He later transferred to a Territorial Force battalion of the South Staffordshire Regiment, and then to the Regular Army.
Vallentin was 32 years old, and a captain in the 1st Battalion, South Staffordshire Regiment, British Army during the First World War when the following deed took place at the First Battle of Ypres for which he was awarded the VC.