Iwan Petrowitsch Pawlow (Russian Иван Петрович Павлов, scient. Transliteration Ivan Petrovič Pavlov; * 14. Septemberjul./ 26. September 1849greg. in Rjasan; † 27. February 1936 in Leningrad) was a Russian physician and physiologist.
He was awarded the Nobel Prize in Physiology or Medicine in 1904 for his work on the digestive glands. He also developed important foundations for behavioral research and thus laid the foundations for behaviorist learning theories. The best-known bearer of his name is probably Pavlov’s dog, on which he demonstrated classical conditioning.