Marian Marianovich Peretyatkovich (Russian: ?????´? ?????´????? ??????´??????; 23 August 1872, Usychi (????? in Ukrainian), Volhyn (now Ukraine) — 22 May 1916, Kyiv (Ukraine) was a Russian and Ukrainian 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.