Pyotr Grigoryevich Sergiev (Russian: Пётр Григорьевич Сергиев; 10 July 1893 – 12 July 1973) was a Soviet parasitologist and epidemiologist, Fellow of the USSR Academy of Medical Sciences (1944), professor, public health organizer, malariologist working with World Health Organization.

Pyotr Sergiev was born in the village of Sretenskoye in the Vyatka Governorate (today's the Kotelnichsky District of the Kirov Oblast), Russian Empire, to a local teacher.

In 1920, he headed the sanitary management of the Western Siberia District; he fought typhus in the challenging conditions during the Russian Civil War.

Between 1921 and 1922, he was a doctor at the Russian Soviet Federative Socialist Republic (RSFSR) Embassy in Afghanistan.

[2] During the Great Patriotic War, he was the head of the department for combating malaria of the People's Commissariat of Health of the USSR.

[8] In 1952, Sergiev and a group of malariologists were awarded the Stalin Prize for developing a system of measures and putting them into practice on a national scale.

He gave lectures on the fight against malaria at the Central Institute for the Improvement of Doctors, a course in parasitology for students of the sanitary faculty of the First Moscow State Medical University.

[10][11] From 1970 until the end of his life, Sergiev was a consultant at the Institute of Medical Parasitology and Tropical Medicine.