Henry Farquharson (c.1675 – 19 December 1739) was a teacher who pioneered the study of mathematics in Russia. He was recruited by Peter the Great, who sought to introduce Western ideas and technology into Russia. He moved to Moscow where he established a school and later established a naval academy in Saint Petersburg. Farquharson had a profound effect on the intellectual life of Russia, not only by introducing mathematical ideas but by helping to create the first generation of explorers, surveyors, cartographers and astronomers.