Vsevolod Nikolayevich Merkulov (Всеволод Николаевич Меркулов in Russian) (10.25(11.7), 1895 - 1953), was the head of NKVD.

In 1913, Merkulov graduated from the Tiflis Gymnasium with the gold medal and became a student at St.Petersburg University, Department of Physics and Mathematics. In 1921-1922, he worked as a detective at the Transportation Unit of the Cheka in Georgia. In 1925-1931, Merkulov held the posts of Head of Secret Operations Directorate and Deputy Head of GPU of Adzharistan . Between 1931 and 1938, he worked on different party assignments. In 1938, Merkulov was appointed Deputy Head of GUGB of NKVD of the USSR. In 1938-1941, he held the post of Deputy People's Commissar of NKVD. Merkulov was People's Commissar of State Security of the USSR from February 3, 1941 until July 20, 1941 and from July 20, 1943 until 1946. In 1941-1943, Merkulov was Deputy People's Commissar.