Vyacheslav Vsevolodovich Ivanov (Russian: ???????´? ???´????????? ???´???, 21 August 1929 – 7 October 2017) was a prominent Soviet/Russian philologist, semiotician and Indo-Europeanist probably best known for his glottalic theory of Indo-European consonantism and for placing the Indo-European urheimat in the area of the Armenian Highlands and Lake Urmia.