The 9K111 Fagot (Russian: Фагот; "bassoon") is a second-generation tube-launched semi-automatic command to line of sight (SACLOS) wire-guided anti-tank missile system of the Soviet Union for use from ground or vehicle mounts.

The 9K111 Fagot missile system was developed by the Tula KBP Design Bureau for Instrument Building.

The 9K111 Fagot was developed by the Tula Machinery Design Bureau (Tula KBP) and development began in 1962 with the aim of producing the next generation of SACLOS anti-tank guided missile (ATGM) for use in two roles: as man portable and tank destroyer.

The 9K111 Fagot was developed alongside the 9M113 Konkurs; both missiles use similar technology, differing in size only, and can use the same launchers.

The anti-tank platoon of a Soviet BTR equipped motor rifle battalion had two (sometimes three)[7] ATGM squads, each with two 9K111 Fagot teams.

This initial high speed reduces the missile's deadzone, since it can be launched directly at the target, rather than in an upward arc.