Petr Petrovich Troyanskii (January 1894 – 24 May 1950) was a Russian educator and scholar.
He was born into the family of a railway repair-shop worker in Orenburg in the Southern Urals.
He finished a parish school in Orenburg and passed gymnasia examinations without attending classes, after which he entered the University of St. Petersburg.
In those years he devoted more and more time to putting into practice his idea of a translating machine.
Stenocardia prevented him from completing the work on mechanising translation, which he considered the cause of his whole life.