Karl Viktorovich Pauker (Russian: Карл Ви́кторович Па́укер; January 1893 – 14 August 1937) was an NKVD officer and head of Joseph Stalin's personal security until his arrest and execution.
Pauker was born into Jewish family in Lviv, which was then part of Austria-Hungary.
Pauker elected to stay in Russia after the revolution and joined the Communist Party in 1918.
Pauker took an active part in the purges, including the executions of Grigory Zinoviev and Lev Kamenev.
Pauker was arrested on 15 April 1937, according to Simon Sebag Montefiore, because he "knew too much and lived too well", and he was executed quietly without trial on 14 August 1937.