Marian Marianovich Peretyatkovich (Russian: Мариа́н Мариа́нович Перетя́ткович; 23 August 1872 — 22 May 1916) was a Russian architect. His premature death at the age of 43 limited his career to only eight years of independent practice (1908-1916), however, he managed to excel in a rational (Finnish) variety of late Art Nouveau, Renaissance Revival and Russian Revival in Saint Petersburg and Moscow. He is sometimes compared with Louis Sullivan on account of his insistence on functionality of office buildings.
Peretyatkovich trained at Saint Petersburg Institute of Civil Engineers, graduating in 1901, and the Imperial Academy of Arts under Leon Benois (1901-1906). Still at college, Peretyatkovich became famous as a refined draftsman; architect like Gavriil Baranovsky, Roman Klein and Ivan Rerberg hired him for drafting and interior designs. Thus, Peretyatkovich was involved in such high-profile jobs as the Hotel Metropol, Elisseeff Emporium, and the Pushkin Museum. Before graduation, Peretyatkovich secured a solid reputation among professionals in both capitals of Russia.
In 1907, he travelled over Europe on the Academy study tour, and learned the Finnish version of Art Nouveau practiced by Eliel Saarinen and Lars Sonck, as well as Roman architecture of Southern Europe; both these styles became the trademarks of his short career.