Boris Spiridonovich Stomonyakov (Russian: ????? ???????????? ??????????, 1882-1940) was an ethnic Bulgarian anti-Tsarist revolutionary who later became a trade representative and diplomat for the Union of Soviet Socialist Republics during the decades of the 1920s and 1930s.
Regarded as a close assistant of Soviet People's Commissar of Foreign Affairs Maxim Litvinov, Stomonyakov was one of the top political figures in the Soviet foreign affairs bureaucracy, heading up the Soviet foreign ministry's diplomatic relations with Poland, Lithuania, Latvia, and Estonia from the middle 1920s.
He was promoted to Deputy People's Commissar of Foreign Affairs in 1934.
Stomonyakov fell under suspicion during the latter days of the Great Purge of 1937-1938 and was arrested by the Soviet secret police in December 1938.
After an extensive period of incarceration and interrogation, Stomonyakov was found guilty of being a member of a "counterrevolutionary Trotskyite organization" and spying for Germany and Poland and was sentenced to death.
He was executed on October 16, 1940.
Stomonyakov was posthumously rehabilitated by the Soviet government for a wrongful conviction and execution in 1988.