Karl Ludwig August Friedrich von[1] Phull (or Pfuel) (6 November 1757 – 25 April 1826) was a German general in the service of the Kingdom of Prussia and the Russian Empire.
Phull served as Chief of the General Staff of King Frederick William III of Prussia in the Battle of Jena-Auerstedt.
As a result of the Prussian collapse in the Fourth Coalition, Frederick William sent Phull to serve Tsar Alexander I of Russia.
It is disputed how involved Phull was in the Russian decision to adopt a scorched earth policy during Napoleon's invasion of Russia.
Phull's involvement with the Russian campaign in 1812 is included in Leo Tolstoy's War and Peace, in which the general is known as Pfuel.