Pyotr Lvovich Bark (Russian: Пётр Львович (Людвигович) Барк; Ukrainian: Петро Львович (Людвігович) Барк; 18 April 1869 – 16 January 1937), later Sir Peter Bark was a Russian government official and later a banker.
After studying law at St. Petersburg university, Pyotr Bark entered the Credit Chancellery of the Ministry of Finance in 1891.
He was knighted by King George V of the United Kingdom in 1935 for his contributions to the banking industry.
Bark married Baroness Sofia Leopoldovna von Behr (1867–1957) and had two children: a daughter, Nina (1900–1975) and a son, Georgiy (1904–1936).
Bark died in Aubagne, France, and is buried in the Russian cemetery in Nice.