Count Anatoly (called Anatole) Pavlovich Demidov, 4th Prince of San Donato (Russian: Анатолий Павлович Демидов; 31 November OS: 12 November 1874 in San Donato – 27 October 1943 in Marseille) of the House of Demidov, was the last Prince and member of his house.

He succeeded his elder half-brother Elim Pavlovich Demidov, 3rd Prince of San Donato in 1943 but died in exile in the same year without male issue.

Anatoly Demidov was the son of Pavel Pavlovich Demidov, 2nd Prince of San Donato by his second wife, Princess Elena Petrovna Trubetskaya (1853-1917).

His paternal grandmother was Finnish philanthropist Aurora Karamzin.

In Saint Petersburg on 1 February 1894 he married Evgenia Klimentievna Podmener (Saint Petersburg, 12 December 1871 - Nice, 13 October 1958), who belongs to a wealthy family of the Finnish landowning class (Podmener Estate in Terijoki, Grand Duchy of Finland), by whom he had three daughters: