Vyacheslav Ivanovich Silin (Russian: Вячеслав Иванович Силин; 22 February 1907 – 20 November 1975) was a leading Soviet weapons engineer.
His work was halted while he served in the Red Army from 1931-1932, but throughout the rest of his life, he was a leading figure in the engineering and construction of military technology for the Soviet Union.
Most notably, whilst working at the Central Bureau for the Construction and Research of Recreational and Hunting Weapons during the 1960s, he was directly involved in the creation of the main armament for the BMP-1 and BMD-1 infantry fighting vehicles - the 73mm 2A28 Grom.
In the late 1940s and early 1950s, Silin developed the TKB-440 and TKB-458M 7.62mm machine-guns, as well as the 23mm TKB-505 and 30mm TKB-515 revolving automatic cannons.
As chief designer at the Central Bureau in Tula from 1960 until his death, Silin spearheaded the development of anti-tank grenade launchers.