1585 – c. 1600) was a Russian military engineer and architect who built the Smolensk Kremlin (1597–1602) and the Bely Gorod fortification ring of Moscow (1585–1593).

The architect used the nickname Kon (Russian for stallion) as early as in 1584, as evidenced by his written plea to Ivan the Terrible.

According to this account, Kon ran away to a "foreign land" and learned construction crafts there, specifically emphasizing his skills in fortifications like city walls, dams, ponds, moats, and "secrets" (tunnels).

Kon received a public beating for his defection but was soon assigned to lead the construction of Bely Gorod, a 10-kilometer outer ring of Moscow fortress that stood in the path of present-day Boulevard Ring.

Fyodor Kon has been the subject of an eponymous poem by Dmitri Kedrin (1940).