Vladimir Ivanovich Istomin was a Russian rear admiral (1853) and hero of the Siege of Sevastopol.

The siege of Sevastopol lasted from October 1854 until September 1855, during the Crimean War. The allies landed at Eupatoria on 14 September 1854, intending to make a triumphal march to Sevastopol, the capital of the Crimea, with 50,000 men. Major battles along the way were Alma, Balaklava, Inkerman, Tchernaya, Redan, and, finally, Malakoff. During the siege, the allied navy undertook six bombardments of the capital, on 17 October 1854; and on 9 April, 6 June, 17 June, 17 August, and 5 September 1855.